*{
    margin:0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

section {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
}

section .img-bg{
    position: relative;
    width: 100%;
    height: 100%;
}

section .img-bg img{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

section .noi-dung{
    display: flex;
    justify-content: center;
    align-items: center;
    width: 80%;
    height: 100%;
}

section .noi-dung .form{
    width: 80%;
}


    section .noi-dung .form h2 {
        color: #607d8b;
        font-weight: 500;
        font-size: 1.5em;
        text-transform: uppercase;
        margin-bottom: 20px;
        border-bottom: 4px solid #4d45ff;
        /*display: inline-block;*/
        letter-spacing: 1px;
        text-align: center;
    }

    section .noi-dung .form .input-form {
        margin-bottom: 20px;
    }


        section .noi-dung .form .input-form span {
            font-size: 16px;
            margin-bottom: 5px;
            display: inline-block;
            color: #607db8;
            letter-spacing: 1px;
        }

        section .noi-dung .form .input-form input {
            width: 100%;
            padding: 10px 20px;
            outline: none;
            border: 1px solid #607d8b;
            font-size: 16px;
            letter-spacing: 1px;
            color: #607d8b;
            background: transparent;
            border-radius: 30px;
        }

            section .noi-dung .form .input-form input[type="submit"] {
                background: #4d45ff;
                color: #fff;
                outline: none;
                border: none;
                font-weight: 500;
                cursor: pointer;
                box-shadow: 0 1px 1px rgba(0,0,0,0.12), 0 2px 2px rgba(0,0,0,0.12), 0 4px 4px rgba(0,0,0,0.12), 0 8px 8px rgba(0,0,0,0.12), 0 16px 16px rgba(0,0,0,0.12);
            }

                section .noi-dung .form .input-form input[type="submit"]:hover {
                    background: #f53677;
                }

    section .noi-dung .form .nho-dang-nhap {
        margin-bottom: 10px;
        color: #607d8b;
        font-size: 14px;
    }

    section .noi-dung .form .input-form p {
        color: #607d8b;
    }

        section .noi-dung .form .input-form p a {
            color: #4d45ff;
        }

section .noi-dung .form h3{
    color: #607d8b;
    text-align: center;
    margin: 80px 0 10px;
    font-weight: 500;
}

section .noi-dung .form .icon-dang-nhap{
    display: flex;
    justify-content: center;
    align-items: center;
}

section .noi-dung .form .icon-dang-nhap li{
    list-style: none;
    cursor: pointer;
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
}
section .noi-dung .form .icon-dang-nhap li:nth-child(1){
    color: #3b5999;
}
section .noi-dung .form .icon-dang-nhap li:nth-child(2){
    color: #dd4b39;
}
section .noi-dung .form .icon-dang-nhap li:nth-child(3){
    color: #55acee;
}
section .noi-dung .form .icon-dang-nhap li i{
    font-size: 24px;
    
}

@media (max-width: 768px){
    section .img-bg{
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
    section .noi-dung{
        display: flex;
        justify-content: center;
        align-items: center;
        width: 100%;
        height: 100%;
        z-index: 1;
    }
    section .noi-dung .form{
        width: 100%;
        padding: 40px;
        background: rgba(255 255 255 / 0.9);
        margin: 50px;
    }
    section .noi-dung .form h3{
        color: #607d8b;
        text-align: center;
        margin: 30px 0 10px;
        font-weight: 500;
    }
}