*{
    margin:0;
    padding:0;
    font-family: consolas;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    flex-direction: column;
    background:#050801;
}
a{
    position: relative;
    display: inline-block;
    padding:25px 30px;
    margin: 40px 0;
    color:#03e9f4;
    font-size: 24px;
    text-decoration:none ;
    text-transform: uppercase;
    transition:0.5s;
    letter-spacing: 4px;
    overflow: hidden;
    -webkit-box-reflect: below 1px liner-gradient(transparent,#0005);

}
a:nth-child(1){
    filter:hue-rotate(290deg);
}
a:nth-child(3){
    filter:hue-rotate(110deg);
}

a:hover{
    background: #03e9f4;
    color: #050801;
    box-shadow: 0 0 5px #03e9f4,
                0 0 25px #03e9f4,
                0 0 50px #03e9f4,
                0 0 200px #03e9f4;
}    

a span{
    position: absolute;
    display: block;
}

a span:nth-child(1){
    top:0;
    left:-100%;
    width:100%;
    height:2px;
    background: linear-gradient(90deg, transparent,#03e9f4);
    animation:animate1 1s linear infinite;
}

@keyframes animate1{
    0%{
        left:-100%;
    }
    50%, 100%
    {
        left:100%;
    }
}

a span:nth-child(2){
    top:-100%;
    right:0;
    
    width:2px;
    height:100%;
    background: linear-gradient(180deg, transparent,#03e9f4);
    animation:animate2 1s linear infinite;
    animation-delay: 0.25s;
}

@keyframes animate2{
    0%{
       top:-100%;
    }
    50%, 100%
    {
        top:100%;
    }
}

a span:nth-child(3){
    bottom:0;
    right:-100%;
    
    width:100%;
    height:2px;
    background: linear-gradient(270deg, transparent,#03e9f4);
    animation:animate3 1s linear infinite;
    animation-delay: 0.5s;
}

@keyframes animate3{
    0%{
       right:-100%;
    }
    50%, 100%
    {
        right:100%;
    }
}

a span:nth-child(4){
    bottom:-100%;
    left: 0;
    
    
    width:2px;
    height:100%;
    background: linear-gradient(360deg, transparent,#03e9f4);
    animation:animate4 1s linear infinite;
    animation-delay: 0.75s;
}

@keyframes animate4{
    0%{
      bottom:-100%;
    }
    50%, 100%
    {
        bottom:100%;
    }
}