* {
    box-sizing: border-box;
}

body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    text-align: center;
    margin: 0;
    overflow: hidden;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background: radial-gradient(rgb(6, 9, 43), rgb(1, 3, 20));
}

.key {
    border: 2px solid aqua;
    background-color: black;
    color: white;
    box-shadow: 10px 4px black;
    display: inline-block;
    align-items: center;
    padding: 20px;
    flex-direction: column;
    margin: 35px 20px;
    font-weight: bold;
    min-width: 200px;
    position: relative;
    font-size: 2.5em;
}

.key small {
    position: absolute;
    top: -24px;
    left: 0;
    color: rgb(110, 223, 223);
    margin-top: -25px;
    text-align: center;
    width: 100%;
    font-size: 0.75em;
}