* {
    box-sizing: border-box;
}
body {
    margin: 0;
    padding: 0;
}
.container {
    width: 50%;
    height: 100vh;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}
button {
    width: 250px;
    height: 100px;
    cursor: pointer;
    font-weight: bold;
    font-size: 30px;
}
.blue-belt {
    width: 100%;
    height: 150px;
    color: blue;
    font-size: 60px;
    font-weight: bold;
}