.button-success,
.button-error,
.button-warning,
.button-secondary {
    color: white;
    border-radius: 4px;
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
}

.button-success {
    background: rgb(28, 184, 65); /* this is a green */
}

.button-error {
    background: rgb(202, 60, 60); /* this is a maroon */
}

.button-warning {
    background: rgb(223, 117, 20); /* this is an orange */
}

.button-secondary {
    background: rgb(66, 184, 221); /* this is a light blue */
}
.pure-button {
    width: 18%;
    margin: 10px;
    font-size: 20px;
}
.number{
    font-size: 15px;
    padding: 5px;
}
.three .number{
    text-align:left;
}
#console {
    font-size: 20px;
    font-family: "Helvetica Neue", Helvetica, sans-serif;
    background-color: #acd6ef;
    background-image: -webkit-gradient(linear, left top, left bottom, from(#acd6ef), to(#6ec2e8));
}
.operator{
    border-radius: 50%;
    border: 2px solid #f5f5f5;
}