.yui3-autogrow {
    background: #fff;
    border: 1px solid #abadb3;
    position: relative;
    min-height: 50px;
    width: 150px; /* The default width. */
}
.yui3-autogrow pre,
.yui3-autogrow textarea {
    background: transparent;
    border: 0;
    font: 400 13px/16px helvetica, arial, sans-serif;
    margin: 0;
    outline: 0;
    padding: 5px;
    /* Make the text soft-wrap */
    white-space: pre-wrap;
    word-wrap: break-word;
}
.yui3-autogrow textarea {
    /**
     * The border-box box model is used to allow
     * padding whilst still keeping the overall width
     * at exactly that of the containing element.
     */
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    height: 100%;
    left: 0;
    overflow: hidden; /* Hide any scrollbars */
    position: absolute;
    resize: none; /* Remove WebKit user-resize widget */
    top: 0;
    width: 100%;
}
.yui3-autogrow pre {
    visibility: hidden; /* Hide the text; just using it for sizing */
}