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Un código de Pedro_bugica

HTML

CSS

body {
    width: 100%;
    height: 100vh;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    background-color: rgba(225, 225, 225, 1);
    font-family: "Inter", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

button {
    all: unset;
    cursor: pointer;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
    position: relative;
    border-radius: 999vw;
    background-color: rgba(0, 0, 0, 0.75);
    box-shadow: -0.15em -0.15em 0.15em -0.075em rgba(5, 5, 5, 0.25),
        0.0375em 0.0375em 0.0675em 0 rgba(5, 5, 5, 0.1);
}

button::after {
    content: "";
    position: absolute;
    z-index: 0;
    width: calc(100% + 0.3em);
    height: calc(100% + 0.3em);
    top: -0.15em;
    left: -0.15em;
    border-radius: inherit;
    background: linear-gradient(-135deg,
            rgba(5, 5, 5, 0.5),
            transparent 20%,
            transparent 100%);
    filter: blur(0.0125em);
    opacity: 0.25;
    mix-blend-mode: multiply;
}

button .button-outer {
    position: relative;
    z-index: 1;
    border-radius: inherit;
    transition: box-shadow 300ms ease;
    will-change: box-shadow;
    box-shadow: 0 0.05em 0.05em -0.01em rgba(5, 5, 5, 1),
        0 0.01em 0.01em -0.01em rgba(5, 5, 5, 0.5),
        0.15em 0.3em 0.1em -0.01em rgba(5, 5, 5, 0.25);
}

button:hover .button-outer {
    box-shadow: 0 0 0 0 rgba(5, 5, 5, 1), 0 0 0 0 rgba(5, 5, 5, 0.5),
        0 0 0 0 rgba(5, 5, 5, 0.25);
}

.button-inner {
    --inset: 0.035em;
    position: relative;
    z-index: 1;
    border-radius: inherit;
    padding: 1em 1.5em;
    background-image: linear-gradient(135deg,
            rgba(230, 230, 230, 1),
            rgba(180, 180, 180, 1));
    transition: box-shadow 300ms ease, clip-path 250ms ease,
        background-image 250ms ease, transform 250ms ease;
    will-change: box-shadow, clip-path, background-image, transform;
    overflow: clip;
    clip-path: inset(0 0 0 0 round 999vw);
    box-shadow:
        /* 1 */
        0 0 0 0 inset rgba(5, 5, 5, 0.1),
        /* 2 */
        -0.05em -0.05em 0.05em 0 inset rgba(5, 5, 5, 0.25),
        /* 3 */
        0 0 0 0 inset rgba(5, 5, 5, 0.1),
        /* 4 */
        0 0 0.05em 0.2em inset rgba(255, 255, 255, 0.25),
        /* 5 */
        0.025em 0.05em 0.1em 0 inset rgba(255, 255, 255, 1),
        /* 6 */
        0.12em 0.12em 0.12em inset rgba(255, 255, 255, 0.25),
        /* 7 */
        -0.075em -0.25em 0.25em 0.1em inset rgba(5, 5, 5, 0.25);
}

button:hover .button-inner {
    clip-path: inset(clamp(1px, 0.0625em, 2px) clamp(1px, 0.0625em, 2px) clamp(1px, 0.0625em, 2px) clamp(1px, 0.0625em, 2px) round 999vw);
    box-shadow:
        /* 1 */
        0.1em 0.15em 0.05em 0 inset rgba(5, 5, 5, 0.75),
        /* 2 */
        -0.025em -0.03em 0.05em 0.025em inset rgba(5, 5, 5, 0.5),
        /* 3 */
        0.25em 0.25em 0.2em 0 inset rgba(5, 5, 5, 0.5),
        /* 4 */
        0 0 0.05em 0.5em inset rgba(255, 255, 255, 0.15),
        /* 5 */
        0 0 0 0 inset rgba(255, 255, 255, 1),
        /* 6 */
        0.12em 0.12em 0.12em inset rgba(255, 255, 255, 0.25),
        /* 7 */
        -0.075em -0.12em 0.2em 0.1em inset rgba(5, 5, 5, 0.25);
}

button .button-inner span {
    position: relative;
    z-index: 4;
    font-family: "Inter", sans-serif;
    letter-spacing: -0.05em;
    font-weight: 500;
    color: rgba(0, 0, 0, 0);
    background-image: linear-gradient(135deg,
            rgba(25, 25, 25, 1),
            rgba(75, 75, 75, 1));
    -webkit-background-clip: text;
    background-clip: text;
    transition: transform 250ms ease;
    display: block;
    will-change: transform;
    text-shadow: rgba(0, 0, 0, 0.1) 0 0 0.1em;
    -webkit-user-select: none; 
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

button:hover .button-inner span {
    transform: scale(0.975);
}

button:active .button-inner {
    transform: scale(0.975);
}