.install_form{
    font-size: 16px;
    margin:10px 0;
    font-weight: bold;
}
.install_form span{
    display: inline-block;
    width:25%;
}
.install_index_input{
    width:30%;
    border:1px solid #e5e5e5;
    text-align: center;
    background:#fff;
}
.install_index_input:focus{
    border:1px solid #73a2e9;
}
.div_select{
    text-align: center;
    width:30%;
    display: inline-block;
    position: relative;
    border:1px solid #e5e5e5;
}
.div_select .install_index_input{
    position: absolute;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 25px;
    opacity: 0;
    z-index: 2;
}
.div_select .icon_select{
    background:url("../../images/combo_arrow.png") no-repeat;
    display: inline-block;
    width:40px;
    height:25px;
    position: absolute;
    right: 0;
    top:0;
    z-index: 1;
}