styles.css

.error pre {
    margin-bottom: -10px;
}
.que.regexp .answer {
    padding: 0.3em;
    display: inline;
    color: green;
}
.alternateanswers .regexp,
#alternateanswers .regexp {
    color: #333;
    font-weight: bold;
}
.que.regexp .answer input {
    width: 80%;
}
.maxtotalpenalties {
    color: #f00;
}
.misplacedword,
.wrongword,
.labelmisplacedword,
.labelwrongword {
    color: white;
}
.misplacedword,
.labelmisplacedword {
    background-color: #5cb85c;
}
.wrongword,
.labelwrongword {
    background-color: #d9534f;
}
.labelmisplacedword,
.labelwrongword {
    font-size: 75%;
}

.que.regexp .correctword {
    color: #00f;
}

/* must be a monospace font for correct display of erroneous characters position */
.displayvalidationerrors {
    font-family: Courier New, Courier, monospace;
    color: maroon;
    font-size: 0.9em;
}
.alternateanswers ul.square,
#alternateanswers ul.square {
    list-style: square;
}
.alternateanswers ul {
    margin: 0;
}
.expandalternateanswers {
    background-color: #ffc;
}

/* Editing form. */
body#page-question-type-regexp div[id^=fgroup_id_][id*=answeroptions_] {
    background: #eee;
    margin-top: 0;
    margin-bottom: 0;
    padding-bottom: 5px;
    padding-top: 5px;
    border: 1px solid #bbb;
    border-bottom: 0;
}

body#page-question-type-regexp div[id^=fgroup_id_][id*=answeroptions_] .fgrouplabel label {
    font-weight: bold;
}

body#page-question-type-regexp div[id^=fgroup_id_][id*=answeroptions_] label[for^='id_answer_'] {
    position: absolute;
    left: -10000px;
    font-weight: normal;
    font-size: 1em;
}

body#page-question-type-regexp div[id^=fitem_id_][id*=fraction_] {
    background: #eee;
    margin-bottom: 0;
    margin-top: 0;
    padding-bottom: 5px;
    padding-top: 5px;
    border: 1px solid #bbb;
    border-top: 0;
    border-bottom: 0;
}

body#page-question-type-regexp div[id^=fitem_id_][id*=feedback_] {
    background: #eee;
    margin-bottom: 2em;
    margin-top: 0;
    padding-bottom: 5px;
    padding-top: 5px;
    border: 1px solid #bbb;
    border-top: 0;
}
.btn .helpme[disabled] {
    display: none;
}