index.css

/* Made with love by Mutiullah Samim*/

@import url('https://fonts.googleapis.com/css?family=Numans');

html,body{
background-size: cover;
background-repeat: no-repeat;
height: 100%;
font-family: 'Numans', sans-serif;
}

.containers{
height: 100%;
align-content: center;
}

.card{
height: 370px;
margin-top: auto;
margin-bottom: auto;
width: 400px;
background-color: rgba(0,0,0,0.3) !important;
}

.social_icon span{
font-size: 60px;
margin-left: 10px;
color: #FFC312;
}

.social_icon span:hover{
color: white;
cursor: pointer;
}

.card-header h3{
color: white;
}

.social_icon{
position: absolute;
right: 20px;
top: -45px;
}

.input-group-prepend span{
width: 50px;
background-color: #FFC312;
color: black;
border:0 !important;
}

input:focus{
outline: 0 0 0 0  !important;
box-shadow: 0 0 0 0 !important;

}

.remember{
color: white;
}

.remember input
{
width: 20px;
height: 20px;
margin-left: 15px;
margin-right: 5px;
}

.login_btn{
color: black;
background-color: #FFC312;
width: 100px;
}

.login_btn:hover{
color: black;
background-color: white;
}

.links{
color: white;
}

.links a{
margin-left: 4px;
}

@media (max-width: 992px){
    .c_1{
        padding-top: 100px;
    }   
    .social_icon{
        position: absolute;
        top: -10px;
    }
    .card-header>h3{
        font-size: 22px;
    }
    .input-group>input{  
        font-size: 14px;
    }
    .remember_me{
        font-size: 14px;
    }
    .login_btn{
        font-size: 14px;
    }
    .card-footer>div{
        font-size: 14px;
    }
    .card{
        margin-bottom: 100px;
    }
}

@media (max-width: 576px){
    .remember_me{
        position: absolute;
        right: 240px;
    }
}
@media (max-width: 454px){
    .containers{
        max-width: 300px;
        margin: auto;
    }
    .remember>span{
        position: relative;
        left: -70px;
    }
    .remember_me{
        font-size: 12px;
    }
    .card-header>h3{
        font-size: 18px;
        text-align: center;
    }
    .input-group>input{  
        font-size: 12px;
    }
    .social_icon{
        position: absolute;
        top: -70px;
        right: 50px;
    }
    .card-footer>div{
        font-size: 12px;
    }
}
@media (max-width:336px){
    .remember>span{
        left: 45px;
    }
    .login_btn{
        position: absolute;
        top: 10px;
    }
}
@media (max-width:288px){
    .navbar{
        padding-bottom: 30px;
    }
}