CSS Button with Background Animation on Hover

				
					* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

html,
body {
    display: grid;
    height: 100%;
    place-items: center;
    background-color: #212121;
}

button {
    padding: 0.8em 1.8em;
    border: 2px solid #fff;
    position: relative;
    overflow: hidden;
    background-color: transparent;
    text-align: center;
    text-transform: uppercase;
    font-size: 16px;
    transition: .3s;
    z-index: 1;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    color: #fff;
    cursor: pointer;
}

button::before {
    content: '';
    width: 0;
    height: 300%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
    background: #ffffff;
    transition: 2s ease;
    display: block;
    z-index: -1;
}

button:hover::before {
    width: 105%;
}

button:hover {
    color: #000;
}