.textbox{
    position:fixed;
    left:10%;
    background-color: #333333;
    width: 80%;
    top:100%;
    color:white;
    display: block;
    z-index:999998;
    height: 300px;
}
.textbox-inner {
    position: absolute;
    width:90%;
    height:100%;
    padding:7px;
    display: inline-block;
    font-size: 14px;
}