body {
    margin: 3rem;
    padding: 0;
    font-family: sans-serif;
    font-size: 18px;
    line-height: 1.5;
}

h1 {
    line-height: 1.25;
    margin: 2em 0 0;
}

p {
    margin: .5rem 0;
}

#switcher {
    list-style: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

#switcher li {
    float: left;
    width: 60px;
    height: 30px;
    margin: 0 15px 15px 0;
    border-radius: 30px;
    border: 3px solid black;
}

#grayButton {
    background-color: gray;
}

#whiteButton {
    background-color: white;
}


#blueButton {
    background-color: blue;
}

#yellowButton {
    background-color: yellow;
}