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HTML

CSS

:root {
    --dark: rgb(12, 12, 12);
    --light: white;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}

/* Default (dark theme) */
body {
    min-height: 100vh;
    background-color: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}
button {
    position: relative;
    width: 300px;
    height: 80px;
    background-color: var(--light);
    color: var(--dark);
    border: none;
    border-radius: 20px;
    font-size: 30px;
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.247);
    transition: 0.3s;
    cursor: pointer;
    z-index: 1;
}
button::before {
    content: "";
    position: absolute;
    top: -5px;
    left: -5px;
    width: calc(100% + 10px);
    height: calc(100% + 10px);
    border: 2px solid rgb(255, 255, 255);
    border-radius: 25px;
    pointer-events: none;
    box-sizing: border-box;
    z-index: 0;
}

button:hover{
    transition: 0.2s;
    animation: buttonHoverUp 0.4s forwards;
}

/* Animation button */
@keyframes buttonHoverUp{
    0% {
        width: 300px;
        transition: 0.1s;
        box-shadow: 0 4px 20px rgba(255, 255, 255, 0.247);
    }
    60% {
        width: 330px;
        box-shadow: 0 4px 50px rgba(255, 255, 255, 0.247);
    }
    100% {
        width: 300px;
        transition: 0.3s;
        box-shadow: 0 4px 20px rgba(255, 255, 255, 0.247);
    }
}

@keyframes buttonHoverUpDark{
    0% {
        width: 300px;
        transition: 0.1s;
        box-shadow: 0 4px 30px rgba(12, 12, 12, 0.753);
    }
    60% {
        width: 330px;
        box-shadow: 0 4px 50px rgba(0, 0, 0, 0.808);
    }
    100% {
        width: 300px;
        transition: 0.3s;
        box-shadow: 0 4px 30px rgba(12, 12, 12, 0.753);
    }
}

/* Light theme switch */
body.light-mode {
    background-color: var(--light);
    transition: background 0.3s;
}
body.light-mode button {
    background-color: var(--dark);
    color: var(--light);
    box-shadow: 0 4px 30px rgba(12, 12, 12, 0.753);
}
body.light-mode button::before {
    border: 2px solid rgb(12, 12, 12);
}
body.light-mode button:hover{
    animation: buttonHoverUpDark 0.4s forwards;
}