*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'helvetica neue';
    color: #fff;
}

html, body {
    height: 100%;
    width: 100%;
}

body {
    background-color: black;
}

h1{
    color: white;
}

#inc{
    color: yellow;
    background-color: green;
}

#dec{
    color: yellow;
    background-color: blue;
}

#bulb{
    height: 300px;
    width: 300px;
    border-radius: 50%;
    border: 4px solid white;
    background-color: grey;
}

button{
    padding: 10px 30px;
    font-size: 20px;
    margin: 50px;
    color: black;
    background-color: white;
}