body {
    font-family: 'Roboto', sans-serif;
    padding: 0;
    margin: 0;
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 40px 20px;
    background-color: whitesmoke;
    justify-content: center;
}
header {
    padding: 0 0 30px 0;
    font-size: 30px;
}

.keyboard {
    width: 100%;
}

.key-row {
    display: flex;
    justify-content: space-around;
    margin: 0 0 10px 0;
}

.key {
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
    width: 80px;
    height: 60px;
    background-color: white;
    cursor: pointer;
}

.space {
    width: 100%;
}

input {
    width: 100%;
    margin: 0 0 20px 0;
    height: 40px;
}