.neonbuttondiv
{
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    flex-direction: column;
    background: #050801;
}

@media (max-width: 770px)
{
    .neonbuttondiv
    {
        width: 100%;
    }
}

.neonbuttondiv a
{
    position: relative;
    display: inline-block;
    padding: 25px 30px;
    margin: 40px 0;
    color: #03e9f4;
    font-size: 24px;
    text-decoration: none;
    text-transform: uppercase;
    overflow: hidden;
    transition: .5s;
    letter-spacing: 4px;
    -webkit-box-reflect: below 1px linear-gradient(transparent, #0005)
}

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

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

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

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

.neonbuttondiv 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%;
    }
}

.neonbuttondiv 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: .25s;
}

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

.neonbuttondiv 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: .5s;
}

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

.neonbuttondiv 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: .75s;
}

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