.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;
}