.container {
    margin: 1px auto;
    max-width: 600px;
    min-width: 50px;
    text-align: center;
}

.container .progress {
    margin: 0 auto;

}

.progress {
    padding: 1px;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 6px;
    -webkit-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.25), 0 1px rgba(255, 255, 255, 0.08);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.25), 0 1px rgba(255, 255, 255, 0.08);
}

.progress-bar {
    height: 16px;
    border-radius: 4px;
    background-image: -webkit-linear-gradient(top, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.05));
    background-image: -moz-linear-gradient(top, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.05));
    background-image: -o-linear-gradient(top, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.05));
    background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.05));
    -webkit-transition: 0.4s linear;
    -moz-transition: 0.4s linear;
    -o-transition: 0.4s linear;
    transition: 0.4s linear;
    -webkit-transition-property: width, background-color;
    -moz-transition-property: width, background-color;
    -o-transition-property: width, background-color;
    transition-property: width, background-color;
    -webkit-box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.25), inset 0 1px rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.25), inset 0 1px rgba(255, 255, 255, 0.1);
}

/*
 * Note: using adjacent or general sibling selectors combined with
 *       pseudo classes doesn't work in Safari 5.0 and Chrome 12.
 *       See this article for more info and a potential fix:
 *       https://css-tricks.com/webkit-sibling-bug/
 */



.radio {
    display: none;
}

.label {
    display: inline-block;
    margin: 0 5px 20px;
    padding: 3px 8px;
    color: #aaa;
    text-shadow: 0 1px black;
    border-radius: 3px;
    cursor: pointer;
}

.radio:checked + .label {
    color: white;
    background: rgba(0, 0, 0, 0.25);
}