style.css

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&display=swap');
html{
    box-sizing:border-box;
}
body{
    margin:0;
    min-height:100vh;
    display:flex;
    justify-content: center;
    align-items:center;
    background: rgb(37,37,37);
}
.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;
    height: 75px;
    width: 120px;
    font-family: barlow, sans-serif;
    font-size: 25px;
    color: white;
    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, #373737);
}
button:active{
    transform: translateY(3px);
    box-shadow: 0 6px 6px 0 rgba(0,0,0,0.3);
}