stylesheet.css

html, body

{

margin: 10 10 10 10;

}

.button

{

border: none;

color: black;

text-align: center;

font-size: 10em;

padding: 25px 25px;

cursor: pointer;

width: 100%;

height: 50vh;

}

#ON

{

background-color: blue;

}

#OFF

{

background-color: red;

}