main.css

    .slidecontainer {
      width: 100%;
    }
    .slider {
      -webkit-appearance: none;
      width: 100%;
      height: 15px;
      border-radius: 5px;
      background: #d3d3d3;
      outline: none;
      opacity: 0.7;
      -webkit-transition : .2s;
      transition: opacity .2s;
    }
    .slider:hover{
      opacity: 1;
    }
    .slider::-webkit-slider-thumb {
      -webkit-appearance: none;
      appearance: none;
      width: 25px;
      height: 25px;
      border-radius: 50%;
      background: #4CAF50;
      cursor: pointer;
    }
    .slider::-moz-range-thumb {
      width: 25px;
      height: 25px;
      border-radius: 50%;
      background: #4CAF50;
      cursor: pointer;
    }
    nav{
      width: 100%;
      height: 250px;
      background-color: #87ceeb;
      background-image: linear-gradient(to bottom right, #2b524f,#255951,#2d6163,#2f5561,#266062,#2f5b42,#245f43);
    }

    #header-box{
      width: 105px;
      /* height: 100px; */
      /* image-orientation:  */
      background-color: red;
      position: relative;
      -webkit-animation-name: header;
      -webkit-animation-duration : 4s;
      animation-name: header;
      animation-duration: 4s;
      animation-iteration-count: infinite;
    }

    footer{
      width: 100%;
      height: 150px;
      background-color: inherit;
    }

    /*@-webkit-keyframes header{

        0% { background-color: red; left:0px; top:0px;}
        10% { -webkit-transform: rotateZ(90deg); }
        25% { background-color: yellow; left:92%; top:0px;}
        50% { background-color: blue; left:92%; top:192px;}
        60% { -webkit-transform: rotateZ(-90deg); }
        75% { background-color: green; left:0px; top:192px;}
        100% { background-color: red; left:0px; top:0px;}
    }

    @@keyframes header {
      0% { background-color: red; left:0px; top:0px;}
      10% { -webkit-transform: rotateZ(90deg); }
      25% { background-color: yellow; left:800px; top:0px;}
      50% { background-color: blue; left:800px; top:800px;}
      60% { -webkit-transform: rotateZ(-90deg); }
      75% { background-color: green; left:0px; top:800px;}
      100% { background-color: red; left:0px; top:0px;}
    }*/
    #heading{
      text-align: center;
      font-size: 35px;
      margin-top: 30px;
      font-weight: bold;
    }
    .btn-success{
      background-color: #2b524f;
      border-color: #245f43;
    }
    .btn-success:hover{
      background-color: #245f43;
      border-color: #2b524f;
    }
    a{
      color: #2b524f;
      background-color: #e5e5e5;
      opacity: 0.7;
    }
    a:hover{
      color: #245f43;
      background-color: #d8d8d8;
      opacity: 1.0;
    }