File: engine/modules/core/form/css/form.css

.form-item.validation-error input,
.form-item.validation-error select,
.form-item.validation-error textarea
{
    border: 1px solid red !important;
}

.form-item-disabled {
    color: #bbb;
}

.validation-error {
    color: white;
    background: red;
    padding-left: 5px;
    padding-right: 5px;
    height: 20px;
    line-height: 20px;
    font-size: 10px;
    font-family: "Verdana";
    text-align: center;
    border-radius: 15px;
    text-transform: uppercase;
    display: inline-block;
    position: absolute;
    bottom: -25px;
    left: 0;
    overflow:scroll;
    overflow-y: hidden;
    white-space:nowrap;

}

div.has-validation-errors {
    border-style: dashed;
    border-width: 1px;
    border-color: red;

}

.has-validation-errors label {
    color: red;
}

.has-validation-errors input, .has-validation-errors select, .has-validation-errors textarea {
    border-color: red;
}

.form-item-required {
    color: red;
}

.form-item-add {
    color: green;
}

.form-item-remove {
    color: red;
}

.form-item-wrapper {
    position: relative;
}

.form-item {
    font-size: 0.8em;
}