body{
    margin: 0;
    padding: 0;
    background: #00092c;
    overflow: hidden;
}

ul{
 position: absolute;    
 width: 100%;
 margin: 20px 0 0;
 padding: 0;
 border-top: 2px solid #777;
 display: flex;
}

ul li{
    list-style: none;
    position: relative;
    top: -20px;
    height: 40px;
    width: 24px;
    border-radius: 50%;
    background:rgba(255, 255, 255, .1);
    margin: 25px;
    z-index: 1;
}

ul li:before{
    content: '';
    position: absolute;
    width: 10px;
    height: 8px;
    background: #444;
    top: -7px;
    left: 7px; 
}

ul li:after{
    content: '';
    position: absolute;
    width: 74px;
    height: 26px;
    border-bottom: 2px solid #444;
    border-radius: 50%;
   top: -24px;
   left: 12px;
}

ul li:last-child:after{
    border-bottom: none;
 }

ul li:nth-child(4n+1){
    background: rgba(255, 255, 0, 1);
    animation: animate1 1.5s linear infinite;
}

@keyframes animate1{
   0%{
    background: rgba(255, 255, 0, .2);
   }

   50%{
    background: rgba(255, 255, 0, 1);
    box-shadow: 0 0 25px rgba(255, 255, 0, 1),
                0 0 45px rgba(255, 255, 0, 1);
   }

   100%{
    background: rgba(255, 255, 0, .2);
   }
}

ul li:nth-child(4n+2){
    background: rgba(255, 255, 0, 1);
    animation: animate2 1.5s linear infinite;
    animation-delay: .5s;
}

@keyframes animate2{
   0%{
    background: rgba(6, 111, 231, .2);
   }

   50%{
    background: rgb(6, 111, 231, 1);
    box-shadow: 0 0 25px rgba(6, 111, 231, 1),
                0 0 45px rgba(6, 111, 231, 1);
   }

   100%{
    background: rgba(255, 0, 255, .2);
   }
}


ul li:nth-child(4n+3){
    background: rgb(255, 0, 0, 1);
    animation: animate3 1.5s linear infinite;
    animation-delay: .5s;
}

@keyframes animate3{
   0%{
    background: rgba(255, 0, 0, .2);
   }

   50%{
    background: rgba(255, 0, 0, 1);
    box-shadow: 0 0 25px rgba(255, 0, 0, 1),
                0 0 45px rgba(255, 0, 0, 1);
   }

   100%{
    background: rgba(255, 0, 255, .2);
   }
}

ul li:nth-child(4n+4){
    background: rgb(63, 238, 10, 1);
    animation: animate4 1.5s linear infinite;
    animation-delay: .8s;
}

@keyframes animate4{
   0%{
    background: rgba(63, 238, 10, .2);
   }

   50%{
    background: rgba(63, 238, 10, 1);
    box-shadow: 0 0 25px rgba(63, 238, 10, 1),
                0 0 45px rgba(63, 238, 10, 1);
   }

   100%{
    background: rgba(255, 0, 255, .2);
   }
}