.sd-form-error {

    max-height: 500px;
    opacity: 1;
    display: block;
    overflow: hidden;
    position: relative;

    font-size: 13px;
    background-color: rgba(255,0,0, 0.2);
    color: #F00;
    border-radius: 4px;
    font-weight: 400;

    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -ms-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;

    margin-bottom: 20px;
    margin-left: 3px;
    margin-right: 3px;
    margin-top: 10px;
    padding: 10px;
    padding-left: 40px;
}

.sd-form-error:empty {
     max-height: 0;
     opacity: 0;
     margin: 0;
     padding: 0;
}

.sd-form-error:not(:empty):before {
     content: "\00d7";
     color: #F00;
     display: inline-block;
     position: absolute;
     left: 15px;
}

.sd-form-field-invalid {
    border-color: #F00 !important;
}

.sd-form-field-valid {
    border-color: #76e081 !important;

animation-name: sd-form-field-valid-fadeout;
    animation-duration: 1s;
    animation-delay: 1.5s;
}

@keyframes sd-form-field-valid-fadeout {
    from { border-color: #76e081 !important; }
    to { border-color: transparent !important; }
}