button {
    --c: #fff;
    background:
        linear-gradient(90deg, #0000 33%, #fff5, #0000 67%) var(--_p, 100%)/300% no-repeat,
        #0f9ab7;
    color: #0000;
    border: none;
    transform: perspective(500px) rotateY(calc(20deg*var(--_i, -1)));
    text-shadow:
        calc(var(--_i, -1)* 0.08em) -.01em 0 var(--c),
        calc(var(--_i, -1)*-0.08em) .01em 2px #0004;
    outline-offset: .1em;
    transition: 0.3s;
    padding: 10px 30px !important;
    border-radius: 20px !important;
}

button:hover,
button:focus-visible {
    --_p: 0%;
    --_i: 1;
}

button:active {
    text-shadow: none;
    color: var(--c);
    box-shadow: inset 0 0 9e9q #0005;
    transition: 0s;
}
/*
body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-content: center;
    background: #f8fbff;
}*/

button {
    font-family: system-ui, sans-serif;
    font-weight: bold;
    font-size: 4rem;
    margin: 0;
    cursor: pointer;
    padding: .1em .3em;
}