/* ---- button ---- */

.button {
    display: inline-block;
    padding: 0.5em 1.0em;
    background: #EEE;
    border: none;
    border-radius: 7px;
    background-image: linear-gradient( to bottom, hsla(0, 0%, 0%, 0), hsla(0, 0%, 0%, 0.2) );
    color: #222;
    font-family: sans-serif;
    font-size: 16px;
    text-shadow: 0 1px white;
    cursor: pointer;
}

.button:hover {
    background-color: #8CF;
    text-shadow: 0 1px hsla(0, 0%, 100%, 0.5);
    color: #222;
}

.button:active,
.button.is-checked {
    background-color: #28F;
}

.button.is-checked {
    color: white;
    text-shadow: 0 -1px hsla(0, 0%, 0%, 0.8);
}

.button:active {
    box-shadow: inset 0 1px 10px hsla(0, 0%, 0%, 0.8);
}

/* ---- button-group ---- */

.button-group {
    margin-bottom: 20px;
}

.button-group:after {
    content: '';
    display: block;
    clear: both;
}

.button-group .button {
    float: left;
    border-radius: 0;
    margin-left: 0;
    margin-right: 1px;
}

.button-group .button:first-child { border-radius: 0.5em 0 0 0.5em; }
.button-group .button:last-child { border-radius: 0 0.5em 0.5em 0; }

/* ---- isotope ---- */

.centered-div {
    display:inline-block; margin:0 auto;
}