div.a {
    display: inline-block;
    width:40%;
    margin:10px;
    vertical-align: top
}
.container ul {
    list-style-type: none;
    margin: 10px;
    padding: 0;
    border: 0px;
    height: 100px;
    overflow: auto;
}

.container ul li{
    display: block;
    color: black;
    text-decoration: none;
    line-height: 30px;
    text-indent: 10px;
}
.container ul li:nth-child(2n+1){
    background-color: yellowgreen;
}
.container ul li:nth-child(2n){
    background-color: lightgreen;
}
.container ul li a{
    display: block;
    cursor: pointer;
    color: royalblue;
    text-decoration: none;
    line-height: 30px;
}

.container ul li a:hover, ul li a.clicked{
    color: yellowgreen;
    text-decoration: none;
    background-color: royalblue;
}
.loader {
    position: fixed;
    left: 50%;
    top: 50%;
    bottom: 50%;
    z-index: 1;
    width: 150px;
    height: 150px;
    margin: -75px 0 0 -75px;
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3498db;
    width: 120px;
    height: 120px;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
  }
  
  @-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); }
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  
  /* Add animation to "page content" */
  .animate-bottom {
    position: relative;
    -webkit-animation-name: animatebottom;
    -webkit-animation-duration: 1s;
    animation-name: animatebottom;
    animation-duration: 1s
  }
  
  @-webkit-keyframes animatebottom {
    from { bottom:-100px; opacity:0 } 
    to { bottom:0px; opacity:1 }
  }
  
  @keyframes animatebottom { 
    from{ bottom:-100px; opacity:0 } 
    to{ bottom:0; opacity:1 }
  }
  #overlay {
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 999;
    position: fixed;
    left: 0;
    top: 0;
    bottom:0;
    width: 100%;
    overflow: visible;
    display: none;
}
.btn-default {
  background-color: #eee !important;
}