html, body{
    margin: 0;
    padding: 0;
    height:100%;
    background-color: #808080;
    border-style:none;
    font-family: sans-serif;
}
input, img, ul, li {
    margin: 0;
    padding: 0;
    border-style:none;
}
#header{
    position: absolute;
    background-color: #fff;
    width: 100%;
    height: 70px;
}
.nav_img1, .nav_img2 {
    position: absolute;
    top: 0px;
}

ul{
    position: absolute;
    left: 460px;
    top: 30px;
    width: 500px;
    
}
li{
    width: 80px;
    height: 10px;
    padding-right: 30px;
    float: left;
}
#logo{
    position: absolute;
    top: 0px;
    margin: 20px 70px 20px 30px ;
    height: 30px;
    width: 361px;
}
#content_BG{
    position: absolute;
    background-image: url("img/BG_img.jpg");
    height: 100%;
    width: 100%;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-color: #000;
    /*filter: blur(10px);
    opacity: 0.8;*/
}
#content{
    position: absolute;
    height: 100%;
    width: 100%;
    z-index: -1;
    /*background-color: #fff;*/
}
#login_box{
    position: absolute;
    width: 375px;
    height: 50px;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    background-color: #fff;
}
#pass_defolt{
    position: absolute;
    top: 15px;
    left: 20px;
    color: #ccc;
}
#pass_text{
    position: absolute;
    padding-left: 20px;
    width: 355px;
    height: 50px;
    font-size: 18px;
    opacity: 0;
    outline: solid 0px #ff0000;
}
#BTN_submit{
    position: absolute;
    right: 5px;
    top: 5px;
    height: 40px;
    width: 40px;
    cursor: pointer;
}