:root {
    --red: #fe2031;
    --dark: #0d0d0c;
    --gray: #111111;
    --white: #ffffff;
    --gray-dark: #272727;
    --shadow: 0 10px 20px rgba(0, 0, 0, 0.7), 0 0 1px rgba(255, 255, 255, 0.05);
}

.animated-button {
    position: relative;
    display: inline-block;
    padding: 10px 20px;
    font-weight: bold;
    color: var(--red);
    font-size: 16px;
    text-decoration: none;
    text-transform: uppercase;
    overflow: hidden;
    transition: .5s;
    margin-top: 40px;
    letter-spacing: 3px;
    background: none;
    border: none;
    cursor: pointer;
    max-width: 500px;
    width: auto; 
}

.animated-button:hover {
    background: var(--red);
    color: var(--dark);
    border-radius: 5px;
}

.animated-button span {
    position: absolute;
    display: block;
}

.animated-button span:nth-child(1) {
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--red));
    animation: btn-anim1 1.5s linear infinite;
}

.animated-button span:nth-child(2) {
    top: -100%;
    right: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, var(--red));
    animation: btn-anim2 1.5s linear infinite;
    animation-delay: .375s;
}

.animated-button span:nth-child(3) {
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(270deg, transparent, var(--red));
    animation: btn-anim3 1.5s linear infinite;
    animation-delay: .75s;
}

.animated-button span:nth-child(4) {
    bottom: -100%;
    left: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(360deg, transparent, var(--red));
    animation: btn-anim4 1.5s linear infinite;
    animation-delay: 1.125s;
}

@keyframes btn-anim1 {
    0% { left: -100%; }
    50%, 100% { left: 100%; }
}

@keyframes btn-anim2 {
    0% { top: -100%; }
    50%, 100% { top: 100%; }
}

@keyframes btn-anim3 {
    0% { right: -100%; }
    50%, 100% { right: 100%; }
}

@keyframes btn-anim4 {
    0% { bottom: -100%; }
    50%, 100% { bottom: 100%; }
}