@media screen and (max-width:320px){
    .about_main {
        padding-bottom: 30px;
    }
    .login_main {
        margin-top:50px;
    }
    .about_logo{
        width: 80%;
        height: 75px;
    }
    .about_content {
        width: 80%;
        margin-top: 50px;
    }
    .about_text {
        font-size: 20px;
    }
    .Welcome_box {
        margin: 40px auto 0px auto;
    }
    .Welcome_img {
        width: 80%;
    }
}

@media screen and (min-width:321px) and  (max-width:767px){
    .about_main {
        padding-bottom: 30px;
    }
    .login_main {
        margin-top:50px;
    }
    .about_logo{
        max-width: 80%;
        height: 75px;
    }
    .about_content {
        width: 80%;
        margin-top: 50px;
    }
    .about_text {
        font-size: 20px;
    }
    .Welcome_box {
        margin: 40px auto 0px auto;
    }
    .Welcome_img {
        max-width: 80%;
    }
}

@media screen and (min-width:768px) and  (max-width:991px){
    
}

@media screen and (min-width:992px) and  (max-width:1199px){
    
}

@media screen and (min-width:1200px) and (max-width:1919px) {
    
}

@media screen and (min-width:1920px){
    
}