sample.css

/* This is the .less I need for my project.  Mileage may vary. */
.input-wrapper {
    position: relative;
    display: -moz-inline-box;
    display: inline-block;
    *display: inline; /* ie6&7 */
    zoom: 1;
    background: #FFF;
    vertical-align: top;
}

.input-wrapper input,
.input-wrapper textarea {
    position: relative;
    z-index: 2;
    background: transparent;
    margin: 0;
}

.input-wrapper label {
    z-index: 1;
    position: absolute;
    font-weight: normal;
    top: 50%;
    left: 0;
    min-height: 1em;
    margin-top: -.6em;
    text-align: left;
    font-size: 1em;
    color: #AAA;
    overflow-x: hidden;
    padding-left: 14px;
    cursor: text;
}

.input-wrapper.focus label {
    opacity: 0.6;
}

.input-wrapper.filled label {
    display: none;
}