:root {
    --start_color: #00a13c;
    /*#03e9f4;*/
}

.neon {
    cursor: pointer;
    text-align: center;
    color: var(--start_color);
    margin: 2em;
    margin-bottom: 5em;
    position: relative;
    font-weight: 900;
    padding: 25px 30px;
    text-decoration: none;
    /*text-transform: uppercase;*/
    transition: 0.5s;
    letter-spacing: 4px;
    overflow: hidden;
    border-radius: 15px;
    box-shadow: inset 0 0px 25px 2px var(--start_color);
    /*z-index: 2;*/


}

.neon:hover {
    background: var(--start_color);
    color: var(--white);
    /*darkblue;*/
    box-shadow: 0 0 5px var(--start_color),
        0 0 25px var(--start_color),
        0 0 50px var(--start_color),
        0 0 200px var(--start_color);
    -webkit-box-reflect: below 1px linear-gradient(transparent, #0005);
}

.neon_market {
    filter: hue-rotate(0deg);
}

.neon_catharsis {
    filter: hue-rotate(79deg);
}

.neon_negativity {
    filter: hue-rotate(-215deg);
}

.neon_roulette {
    filter: hue-rotate(110deg);
}

.neon span {
    position: absolute;
    display: block;
}

.neon span:nth-child(1) {
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--start_color));
    animation: animate1 1s linear infinite;
}

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

    50%,
    100% {
        left: 100%;
    }
}

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

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

    50%,
    100% {
        top: 100%;
    }
}

.neon span:nth-child(3) {
    bottom: 0;
    right: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(270deg, transparent, var(--start_color));
    animation: animate3 1s linear infinite;
    animation-delay: 0.50s;
}

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

    50%,
    100% {
        right: 100%;
    }
}


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

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

    50%,
    100% {
        bottom: 100%;
    }
}