.numpad {
    display: -webkit-flex;
    display: flex;

    -webkit-flex-direction: row;
    -moz-flex-direction: row;
    -ms-flex-direction: row;
    flex-direction: row;

    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    justify-content: center;

    flex-wrap: wrap;

    padding: 2rem  0.5em 1rem;

    width: 25em;
    margin: auto;
}

.numpad .numpad-column {

    display: -webkit-flex;
    display: flex;

    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    justify-content: center;

    width: 8em;
    margin-bottom: 1em;
}
.numpad .numpad-column.triple,
.numpad .numpad-column .button.fluid{
    width: 100%;
}
.numpad .numpad-column .button {

    color: white;
    font-size: 1.5em !important;

    width: 4em;
    height: 4em;
    padding: 1em;

    display: -webkit-flex;
    display: flex;

    -webkit-justify-content: center;
    -moz-justify-content: center;
    -ms-justify-content: center;
    justify-content: center;

    -webkit-align-items: center;
    -moz-align-items: center;
    -ms-align-items: center;
    align-items: center;
}