* {
	box-sizing: border-box;
}

th, tr, td{
	padding : 10px;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-footer {
  margin-top: auto;
  background-image: url("");
  background-color: black;
  height: 50px;           
  background-position: center;
  background-repeat: repeat-x;
  background-size: auto;
  position: relative;
} 

hr {
  margin-left: 0;
  margin-right: 0;
}

a{
	text-decoration: none;
}

h1{
	color: white;
        text-align: center;
}

p{
       color: white;
       font-size: 150%;
}

/* radio customization */

label {
  color: white;
  margin-right: 15px;
  line-height: 32px;
  padding: 20px;
}

.radio {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;

  border-radius: 50%;
  width: 16px;
  height: 16px;

  border: 2px solid #999;
  transition: 0.2s all linear;
  outline: none;
  margin-right: 5px;
  position: relative;
  top: 4px;
  display: inline-block;
  vertical-align: top;
}

input:checked {
  border: 6px solid white;
}

legend {
  color: white;
  background-color: black;
  padding: 5px 10px;
  border-radius: 0;
  border: 0;
  font-size: 14px;
}

/* navbar */

body {
  background-color: black;
  margin: 0;
}

h3 {
	color: black;
}

.navbar {
  overflow: hidden;
  background-color: black;
  font-family: Arial, Helvetica, sans-serif;
}

.navbar a {
  float: left;
  font-size: 16px;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

.dropdown {
  float: left;
  overflow: hidden;
}

.dropdown .dropbtn {
  font-size: 16px;
  border: none;
  outline: none;
  color: white;
  padding: 14px 16px;
  background-color: inherit;
  font: inherit;
  margin: 0;
}

.navbar a:hover, .dropdown:hover .dropbtn {
  background-color: red;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #ccc;
  width: 100%;
  left: 0;
  z-index: 1;
  box-shadow: 0px 8px 8px 0px #ccc;
}

.dropdown-content .header {
  background: red;
  padding: 16px;
  color: white;
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* Create three equal columns that floats next to each other */
.column {
  float: left;
  width: 15%;
  padding: 10px;
  background-color: #ccc;
  height: 55vh;
}

.column a {
  float: none;
  color: black;
  padding: 10px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.column a:hover {
  background-color: #ddd;
}

/* Clear floats after the columns */
.row:after {
  content: "";
  display: table;
  clear: both;
}

h3{
	padding-left: 10px;
}

/* Responsive layout - makes the three columns stack on top of each other instead of next to each other */
@media screen and (max-width: 600px) {
  .column {
    width: 100%;
    height: auto;
  }

  .radio, label{
	padding: 0px;
	}
}

div{
	color: white;
}

*,
*::before,
*::after {
        box-sizing: border-box;
}

h1{
	z-index: 2;
	position: relative;
	color: coral;
	text-shadow: 1px 1px  crimson;
}

.hero-image {
  background-image: linear-gradient(to bottom, rgba(0,0,0,0) 0%,rgba(137,137,137,0.8) 100%),url("skyline.png");
  height: 50px;
  background-position: center;
  background-repeat: repeat-x;
  background-size: auto;
  position: relative;
}

.container {
	z-index: 1;
	position: absolute;
	overflow: hidden;
	display: flex;
	width: 100%;
	height: 200px;	
}

.bird {
  background-image: url("bird-cells-white.svg");
  background-size: auto 100%;
  width: 88px;
  height: 125px;
  will-change: background-position;
  -webkit-animation-name: fly-cycle;
          animation-name: fly-cycle;
  -webkit-animation-timing-function: steps(10);
          animation-timing-function: steps(10);
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
}
.bird--one {
  -webkit-animation-duration: 1s;
          animation-duration: 1s;
  -webkit-animation-delay: -0.5s;
          animation-delay: -0.5s;
}
.bird--two {
  -webkit-animation-duration: 0.9s;
          animation-duration: 0.9s;
  -webkit-animation-delay: -0.75s;
          animation-delay: -0.75s;
}
.bird--three {
  -webkit-animation-duration: 1.25s;
          animation-duration: 1.25s;
  -webkit-animation-delay: -0.25s;
          animation-delay: -0.25s;
}
.bird--four {
  -webkit-animation-duration: 1.1s;
          animation-duration: 1.1s;
  -webkit-animation-delay: -0.5s;
          animation-delay: -0.5s;
}

.bird-container {
  position: relative;
  overflow: hidden;
  top: -20px;
  left: -11.6vw;
  -webkit-transform: scale(0) translateX(-10vw);
          transform: scale(0) translateX(-10vw);
  will-change: transform;
  -webkit-animation-name: fly-right-one;
          animation-name: fly-right-one;
  -webkit-animation-timing-function: linear;
          animation-timing-function: linear;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
}
.bird-container--one {
  -webkit-animation-duration: 15s;
          animation-duration: 15s;
  -webkit-animation-delay: 0;
          animation-delay: 0;
}
.bird-container--two {
  -webkit-animation-duration: 16s;
          animation-duration: 16s;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
}
.bird-container--three {
  -webkit-animation-duration: 14.6s;
          animation-duration: 14.6s;
  -webkit-animation-delay: 9.5s;
          animation-delay: 9.5s;
}
.bird-container--four {
  -webkit-animation-duration: 16s;
          animation-duration: 16s;
  -webkit-animation-delay: 10.25s;
          animation-delay: 10.25s;
}

@-webkit-keyframes fly-cycle {
  100% {
    background-position: -900px 0;
  }
}

@keyframes fly-cycle {
  100% {
    background-position: -900px 0;
  }
}
@-webkit-keyframes fly-right-one {
  0% {
    -webkit-transform: scale(0.3) translateX(-10vw);
            transform: scale(0.3) translateX(-10vw);
  }
  10% {
    -webkit-transform: translateY(2vh) translateX(10vw) scale(0.4);
            transform: translateY(2vh) translateX(10vw) scale(0.4);
  }
  20% {
    -webkit-transform: translateY(0vh) translateX(30vw) scale(0.5);
            transform: translateY(0vh) translateX(30vw) scale(0.5);
  }
  30% {
    -webkit-transform: translateY(4vh) translateX(50vw) scale(0.6);
            transform: translateY(4vh) translateX(50vw) scale(0.6);
  }
  40% {
    -webkit-transform: translateY(2vh) translateX(70vw) scale(0.6);
            transform: translateY(2vh) translateX(70vw) scale(0.6);
  }
  50% {
    -webkit-transform: translateY(0vh) translateX(90vw) scale(0.6);
            transform: translateY(0vh) translateX(90vw) scale(0.6);
  }
  60% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
            transform: translateY(0vh) translateX(110vw) scale(0.6);
  }
  100% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
            transform: translateY(0vh) translateX(110vw) scale(0.6);
  }
}
@keyframes fly-right-one {
  0% {
    -webkit-transform: scale(0.3) translateX(-10vw);
            transform: scale(0.3) translateX(-10vw);
  }
  10% {
    -webkit-transform: translateY(2vh) translateX(10vw) scale(0.4);
            transform: translateY(2vh) translateX(10vw) scale(0.4);
  }
  20% {
    -webkit-transform: translateY(0vh) translateX(30vw) scale(0.5);
            transform: translateY(0vh) translateX(30vw) scale(0.5);
  }
  30% {
    -webkit-transform: translateY(4vh) translateX(50vw) scale(0.6);
            transform: translateY(4vh) translateX(50vw) scale(0.6);
  }
  40% {
    -webkit-transform: translateY(2vh) translateX(70vw) scale(0.6);
            transform: translateY(2vh) translateX(70vw) scale(0.6);
  }
  50% {
    -webkit-transform: translateY(0vh) translateX(90vw) scale(0.6);
            transform: translateY(0vh) translateX(90vw) scale(0.6);
  }
  60% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
            transform: translateY(0vh) translateX(110vw) scale(0.6);
  }
  100% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.6);
            transform: translateY(0vh) translateX(110vw) scale(0.6);
  }
}
@-webkit-keyframes fly-right-two {
  0% {
    -webkit-transform: translateY(-2vh) translateX(-10vw) scale(0.5);
            transform: translateY(-2vh) translateX(-10vw) scale(0.5);
  }
  10% {
    -webkit-transform: translateY(0vh) translateX(10vw) scale(0.4);
            transform: translateY(0vh) translateX(10vw) scale(0.4);
  }
  20% {
    -webkit-transform: translateY(-4vh) translateX(30vw) scale(0.6);
            transform: translateY(-4vh) translateX(30vw) scale(0.6);
  }
  30% {
    -webkit-transform: translateY(1vh) translateX(50vw) scale(0.45);
            transform: translateY(1vh) translateX(50vw) scale(0.45);
  }
  40% {
    -webkit-transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
            transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
  }
  50% {
    -webkit-transform: translateY(0vh) translateX(90vw) scale(0.45);
            transform: translateY(0vh) translateX(90vw) scale(0.45);
  }
  51% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
            transform: translateY(0vh) translateX(110vw) scale(0.45);
  }
  100% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
            transform: translateY(0vh) translateX(110vw) scale(0.45);
  }
}
@keyframes fly-right-two {
  0% {
    -webkit-transform: translateY(-2vh) translateX(-10vw) scale(0.5);
            transform: translateY(-2vh) translateX(-10vw) scale(0.5);
  }
  10% {
    -webkit-transform: translateY(0vh) translateX(10vw) scale(0.4);
            transform: translateY(0vh) translateX(10vw) scale(0.4);
  }
  20% {
    -webkit-transform: translateY(-4vh) translateX(30vw) scale(0.6);
            transform: translateY(-4vh) translateX(30vw) scale(0.6);
  }
  30% {
    -webkit-transform: translateY(1vh) translateX(50vw) scale(0.45);
            transform: translateY(1vh) translateX(50vw) scale(0.45);
  }
  40% {
    -webkit-transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
            transform: translateY(-2.5vh) translateX(70vw) scale(0.5);
  }
  50% {
    -webkit-transform: translateY(0vh) translateX(90vw) scale(0.45);
            transform: translateY(0vh) translateX(90vw) scale(0.45);
  }
  51% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
            transform: translateY(0vh) translateX(110vw) scale(0.45);
  }
  100% {
    -webkit-transform: translateY(0vh) translateX(110vw) scale(0.45);
            transform: translateY(0vh) translateX(110vw) scale(0.45);
  }
}