JAVASCRİPT ANIMATION

HTML CODES  :

<div id="container">
        <div id="bot-container" onclick="show();">

            <div id="text">JS</div>
                <div class="loader a1"></div>
                <div class="loader a2"></div>
                <div class="loader a3"></div>
                <div class="loader a4"></div>
        </div>
    </div>

CSS CODES :

body{
    margin:0;
    padding:0;
}
#container {
    display: block;
    position: fixed;
    width: 100%;
    height: 100%;
    background-color: #3c005b;
    background: -webkit-radial-gradient(center, ellipse cover, #4e4343 1%,#1a1a1a   100%);
    background: -moz-radial-gradient(center, ellipse cover, ##333333 1%,#0d0011 100%);
}
#bot-container {
    display: block;
    position: fixed;
    top: 50%;
    left: 50%;
    width: 34vh;
    height: 34vh;
    margin-left: -17vh;
    margin-top: -17vh;
    overflow: hidden;
    transition: background-color 500ms;
    cursor: pointer;
}
#text {
    position: absolute;
    left: 2vh;
    top: 2vh;
    width: 30vh;
    height: 30vh;
    background: linear-gradient(135deg, #333333 0%,#1a1a1a 100%);
    font-family: Trebuchet MS;
    font-size: 20vh;
    font-weight: bold;
    color: #aa9600;
    text-align: center;
    line-height: 30vh;
}
.loader {
    display: block;
    position: absolute;
    background-color: #aa9600;
}
.a1 {
    left: 2vh;
    top: 0;
    height: 2vh;
    width: 0;
    animation: ani1 1s linear forwards infinite;
}
.a2 {
    right: 0;
    top: 2vh;
    width: 2vh;
    height: 0;
    animation: ani2 1s linear forwards infinite;
    animation-delay: 0.5s;
}
.a3 {
    right: 2vh;
    bottom: 0;
    height: 2vh;
    width: 0;
    animation: ani3 1s linear forwards infinite;
}
.a4 {
    left: 0;
    bottom: 2vh;
    width: 2vh;
    height: 0;
    animation: ani4 1s linear forwards infinite;
    animation-delay: 0.5s;
}
@keyframes ani1{
  50%{width:32vh; margin-left:0;}
  100%{margin-left:32vh;}
}

@keyframes ani2{
  50%{height:32vh; margin-top:0;}
  100%{margin-top:32vh;}
}

@keyframes ani3{
  50%{width:32vh; margin-right:0;}
  100%{margin-right:32vh;}
}

@keyframes ani4{
  50%{height:32vh; margin-bottom:0}
  100%{margin-bottom:32vh;}
} 

JavaScript CODES :

var screen = false;

        function show() {
            screen = !screen;
            document.getElementById("bot-container").style.backgroundColor = screen ? "#aa9600" : "transparent";
        }


Codepen : https://codepen.io/UmutYurdugulCode/pen/byRWra