style.css

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@1,500&display=swap');

html {
    /* box-sizing explain: without box-sizing, every time you add padding to any element, the page
    could strech. Say your page is 100% of the viewport's width.
    if you add patting to any element, it would make it more than 100% and it would force
    a horizontal scroll bar. Box-sizing prevents that from happening.*/
    box-sizing: border-box;
}

body {
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgb(31, 27, 27) ;
}

/* Button */
.button-container {
    border: 2px solid black;
    padding: 10px;
    border-radius: 7px;
    box-shadow: inset 0 20px 4px -19px rgba(255,255,255,0.7);
}

button {
    cursor: pointer;
    outline: none;
    width: 120px;
    height: 75px;
    font-family: 'Playfair Display', serif;
    font-size: 25px;
    color: white;
    /* Text-shadow gives the text in our button a 3D effect */
    text-shadow: 0 2px 5px black;
    background:linear-gradient(to top, #696969, #575757);
    border:2px solid black;
    border-radius: 7px;
    box-shadow:inset 0 20px 4px -19px rgba(255,255,255,0.4), 0 12px 12px 0 rgba(0,0,0,0.3);
}

button:hover {
    background:linear-gradient(to bottom, #696969, #575757);
}

button:active {
    transform: translateY(3px);
    box-shadow: 0 6px 6px 0 rgba(0,0,0,0.3);
}