#skm-btn {
    position: fixed;
    bottom: 20px;
    left: 30px;
    padding: 8px 5px;

    text-decoration: none;
    text-transform: uppercase;
    transition: 0.5s;
    letter-spacing: 1px;
    overflow: hidden;
    z-index: 9999;

    background: #f5a700;
    color: #ffffff;
    font-weight: 800;
    font-size: 9px;
    box-shadow: 0 0 5px #b7b7b7,
        0 0 5px #b7b7b7,
        0 0 5px #b7b7b7,
        0 0 5px #b7b7b7;
}

#skm-btn:hover {
    background: #ffffff;
    color: #f5a700;
}

#skm-btn:nth-child(1) {
    /*filter: hue-rotate(270deg);*/
}

#skm-btn:nth-child(2) {
    /*filter: hue-rotate(110deg);*/
}

#skm-btn span {
    position: absolute;
    display: block;
}

#skm-btn span:nth-child(1) {
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #4c4476);
    animation: animate1 1s linear infinite;
}

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

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

#skm-btn span:nth-child(2) {
    top: -100%;
    right: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, transparent, #4c4476);
    animation: animate2 1s linear infinite;
    animation-delay: 0.25s;
}

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

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

#skm-btn span:nth-child(3) {
    bottom: 0;
    right: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(270deg, transparent, #4c4476);
    animation: animate3 1s linear infinite;
    animation-delay: 0.50s;
}

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

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


#skm-btn span:nth-child(4) {
    bottom: -100%;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(360deg, transparent, #4c4476);
    animation: animate4 1s linear infinite;
    animation-delay: 0.75s;
}

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

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