.expressionLine {
    width: auto;
    max-width: 100%;
    height: auto;
    border-top: solid 1px #421C52;
    border-bottom: solid 1px #421C52;
    /*padding right for the error icon*/
    padding: 3px 30px 3px 3px;
    border-collapse: collapse;
    box-sizing: border-box;
    position: relative;
    z-index: 10;
    margin-bottom: -1px;
}

.expressionBox {
    margin: 0;
    font-size: 150%;
    font-family: "Times New Roman","Symbola-mq",serif;
    letter-spacing: 2px;
    height: auto;
    width: auto;
    max-width: 100%;
    position: relative;
}

    .expressionBox span.mathquill-editable {
        width: 100%;
        padding-right: 0;
        padding-left: 0;
        /* For the space of clear × button */
        padding-right: 20px;
        box-sizing: border-box;
        display: block;
        /* cross browser min-height */
        min-height: 1em;
        height: auto !important;
        /* Underscore hack for IE */
        _height: 1em;
        /* Underscore hack for IE */
        /* cross browser min-height */
    }

        .expressionBox span.mathquill-editable > * {
            display: inline-block;
        }

    .expressionBox span {
        /*height: 100%;*/
        border: none;
    }

    .expressionBox .clear {
        position: absolute;
        right: 0;
        top: 0;
        cursor: pointer;
        width: 20px;
        height: 20px;
        color: #ddd;
    }

        .expressionBox .clear:hover {
            color: Black;
        }

.error {
    background-color: #fbb;
}

.error-icon-box {
    background: url('../../Images/error.png') no-repeat center center;
    width: 30px;
    height: 30px;
    position: absolute;
    right: 0;
    top: 0;
    z-index: 150;
    cursor: pointer;
}

    .error-icon-box span {
        color: yellow;
        font-size: 30px!important;
        line-height: 30px;
        display: inline-block;
        margin-top: -2px;
        margin-left: -1px;
    }

.error-message-box {
    background-color: #ddd;
    border: solid 1px red;
    padding: 10px;
    box-sizing: border-box;
    margin: 10px;
}

.active {
    background-color: #999;
}