@media screen and (max-width: 320px) {
   body {
        font-size: .4em; /* 10/16 */
    }
    .logo {
        padding-top: 35%;
        background: #fff url(../images/logo.png) no-repeat center bottom;
        background-size: 40%;
    }
    .login label {
        background: #f7f7f7;
        height: 35px;
        line-height: 35px;
        width: 15%;
    }
    .login input {
        font-size: 1.8em;
        width: 70%;
        padding-left: 2.666%;
    }
    .login label i {
        margin-top: 15%;
    }
    .loginID, .loginPwd {
        height: 35px;
    }
    footer i {
        margin-left: 30%;
    }
}
@media screen and (min-width: 320px) and (max-width: 480px)  {
    body {
        font-size: .5em; /* 10/16 */
    }
    .logo {
        padding-top: 40%;
        background: #fff url(../images/logo.png) no-repeat center bottom;
        background-size: 50%;
    }
    .login label {
        background: #f7f7f7;
        height: 40px;
        line-height: 40px;
        width: 15%;
    }
    .login input {
        font-size: 1.8em;
        width: 70%;
        padding-left: 2.666%;
    }
    .login label i {
        margin-top: 20%;
    }
    .loginID, .loginPwd {
        height: 40px;
    }
    footer i {
        margin-left: 30%;
    }
}
@media screen and (min-width: 480px) and (max-width: 640px)  {
    body {
        font-size: .6em; /* 10/16 */
    }
    .logo {
        padding-top: 50%;
        background: #fff url(../images/logo.png) no-repeat center bottom;
        background-size: 50%;
    }
    .login label i {
        margin-top: 15%;
    }
    footer i {
        margin-left: 35%;
    }
}
@media screen and (min-width: 640px) and (max-width: 768px)  {
    body {
        font-size: .7em; /* 10/16 */
    }
    .logo {
        padding-top: 30%;
    }
}
@media screen and (min-width: 768px) and (max-width: 1024px)  {
    body {
        font-size: .8em; /* 10/16 */
    }
    .logo {
        padding-top: 30%;
    }
    footer i {
        margin-left: 40%;
    }
}
@media screen and (min-width: 1024px)  {
   body {
        font-size: .9em; /* 10/16 */
    }
    .logo {
        padding-top: 30%;
    }
}