style.css

.qti-visually-hidden {
    opacity: 0.25;
}

.qti-visually-hidden:focus {
    opacity: 1;
}

.jump-link {
    opacity: 0.25;
}

.jump-link:focus {
    opacity: 1;
}

#navigation{
    position: relative;
}

#next {
    float: right;
}

#overview {
    float: right;
}

#previous {
    float: left;
}

button {
    cursor: pointer;
    padding: 10px 20px;
    border: 1px solid #444;
    margin: 10px;
    border-radius: 8px;
}

ol {
    list-style-type: none;
    display: inline-block;
    width: 33%;
}

li {
    float: left;
    padding: 4px;
}

article {
    width: 50%;
}

aside {
    margin-left: auto;
    margin-right: 5%;
}

:focus {
    -webkit-box-shadow: 0px 0px 4px 4px rgba(0,81,151,1);
    -moz-box-shadow: 0px 0px 4px 4px rgba(0,81,151,1);
    box-shadow: 0px 0px 4px 4px rgba(0,81,151,1);
}

fieldset{
    border-color: #ddd;
}