html, body {
    padding: 0; margin: 0;
    text-align: center;
    background: #1dba9d;
    color: #e0d336;
}

div {
    font-size: 1.5em;
}

button:active {
   background: #ffffff;
}

button {
    background-color: #e0d336;
    border: none;
    color: #1dba9d;
    font-size: 2.8em;
    padding: 0.5em 1.5em;
}