.overlay{
       display: none;
        position: fixed;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        z-index: 999;
        background: rgba(255,255,255,0.8) url("/mekamono/inquiry/img/loading.gif") center no-repeat;
}
body{
        text-align: center;
    }
body.loading{
        overflow: hidden;   
}

body.loading .overlay{
        display: block;
}