body{
    margin:0px;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}
.bg{
    position: fixed;
    width:100%;
    height:100%;
    background-image: url('../../img/backend/backend_bg.png');
    background-size: cover;
    opacity: 0.8;
}
form{
    position: fixed;
    top:50%;
    left: 50%;
    transform: translate(-50%,-50%);
    padding: 3%;
    width:40%;
    background-color:	#FCFCFC;
    text-align:center;
    border-radius:5%;
    overflow: hidden;
    box-shadow: 0px 0px 5px #ADADAD;
}
img{
    width: 100px;
    height: 100px;
}
h1{
    margin-top:5%;
}
h5{
    margin-bottom: 5%;
}
.submit,.back{
    margin-top:3%;
    padding-top:10px;
    padding-bottom:10px;
    width:100%;
    font-size:23px;
    border:0px;
    background-color: 	#66B3FF;
    font-weight:bold;
    cursor: pointer;
    transition: 0.3s;
}


.submit:hover,.back:hover{
    background-color: 	#2894FF;
}



@media (max-width:1600px){   /*PC*/
    img{
        width: 80px;
        height: 80px;
    }
    .submit,.back{
        font-size:20px;
    }
}

@media (max-width:1280px){  /*tablet and laptop*/
    img{
        width: 50px;
        height: 50px;
    }
    h1{
        font-size: 28px;
    }
    h5{
        font-size: 16px;
    }
    form{
        width:40%;
        border-radius:5%;
    }
    
    .submit,.back{
        font-size:14px;
    }
}

@media (max-width:900px){  /*tablet and laptop*/
    form{
        width: 70%;
    }
   
    .submit,.back{
        font-size:16px;
    }
}

@media (max-width:450px){   /*phone*/
    h1{
        margin-top:5%;
    }
    h5{
        margin-bottom:10%;
    }
    form{
        width:95%;
        border-radius:5%;
    }

    .submit,.back{
        margin-top:10%;
        padding-top:10px;
        padding-bottom:10px;
        font-size:24px;
    }
}