* {
margin: 0;
padding: 0;
font-family: sans-serif;
box-sizing: border-box;
text-decoration: none;

}
.wrapper {

    display: flex;
    justify-content: space-around;
 
    min-height: 10vh;
    background-color: #000;
}
a {
    position:relative;
    display: inline-block;
    padding: 20px 30px;
    text-transform: uppercase;
    letter-spacing: 4px;
    color: #03e9f4;
    font-size: 1.2rem;
    font-weight: bold;
    transition: .5s;
    overflow: hidden;
    margin-right: 70 px;
}
a:hover {
    background-color: #03e9f4;
    color: #050801;
    box-shadow: 0 0 5px #03e9f4,
                0 0 25px #03e9f4,
                0 0 50px #03e9f4,
                0 0 200px #03e9f4;
    -webkit-box-reflect: below 1px linear grace;            
}
a:first-child {
    filter: hue-rotate(225deg);
}
a:last-child {
    filter: hue-rotate(90deg);
}
a span {
    position:absolute;
    display: block;
}
a span:nth-child(1){
top: 0;
left: 0;
width: 100%;
height: 1px;
background: linear-gradient(90deg, transparent, #03e9f4);
animation: animate1 1s infinite;

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

a span: nth-child(2) {
    top : - 100%;
    right: 0;
    width:1px;
    height: 100%;
    background : linearGradient(180deg ,transparent, #03e9f4);
    animation: animate2 1s infinite;
    animation-delay: .25s;

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

    a span: nth-child(3) {
       bottom: 0;
        right: 0;
        width:100%;
        height: 1px;
        background : linearGradient(270deg ,transparent, #03e9f4);
        animation: animate3 1s infinite;
        animation-delay: .5s;
    
    }
    @keyframes animate3{
        0%{
           right: -100%;
        }
        100% {
            right: 100%;
        }
        }
        a span: nth-child(4) {
            bottom: -100%;
             right: 0;
             width:1px;
             height: 100%;
             background : linearGradient(360deg ,transparent, #03e9f4);
             animation: animate4 1s infinite;
             animation-delay: .75s;
        }
        @keyframes animate4{
            0%{
               buttom: -100%;
            }
            100% {
                buttom: 100%;
            }
            }  
            /* Footer */
.footer {
    
   position:relative;
   left: 0;
   bottom: 0;
   width: 100%;
   height: 25%;
   background-color: #ffffff;
   display: flex;
   justify-content: center;
    min-height: 20vh;
   

  
}