body{
    background-color: #111845;
}
.principal{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 99%;
    background: #111845a6;
    box-sizing: border-box;
    overflow: hidden;
    box-shadow: 0 20px 50px rgb(23, 32, 90);
    border: 2px solid #2a3cad;
    color: white;
    padding: 20px;
}

.principal:before{
    content: '';
    position:absolute;
    top:0;
    left:-100%;
    width:100%;
    height:100%;
    background: rgba(255,255,255,0.1);
    transition:0.5s;
    pointer-events: none;
}

.principal .content{
    position:absolute;
    top:15px;
    left:15px;
    right:15px;
    bottom:15px;
    border:1px solid #f0a591;
    padding:20px;
    text-align:center;
    box-shadow: 0 5px 10px rgba(9,0,0,0.5);
}

.principal span1{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    box-sizing: border-box;
  
}
.principal span1:nth-child(1)
{
    transform:rotate(0deg);
}
.principal span1:nth-child(2)
{
    transform:rotate(90deg);
}
.principal span1:nth-child(3)
{
    transform:rotate(180deg);
}
.principal span1:nth-child(4)
{
    transform:rotate(270deg);
}

.principal span1:before
{
    content: '';
    position: absolute;
    width:100%;
    height: 2px;
    background: #50dfdb;
    animation: animate 4s linear infinite;
}

@keyframes animate {
    0% {
    transform:scaleX(0);
    transform-origin: left;
    }
    50%
    {
      transform:scaleX(1);
    transform-origin: left;
    }
    50.1%
    {
      transform:scaleX(1);
    transform-origin: right;
    }
    100%
    {
      transform:scaleX(0);
    transform-origin: right;
    }
}