@import url(https://fonts.googleapis.com/css?family=Open+Sans);  

#login {
    width: 100%;
    height: 100%;
    display: block;
    margin: 0;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: url(../img/sssss.jpeg) center fixed;
    background-size: 30%;
    filter: brightness(15%);
}

.login {
    font-family: Open Sans;
    width: 450px;
    height: auto;
    max-width: 90%;
    display: block;
    position: absolute;
    margin: 10px auto;
    left: 0;
    right: 0;
    padding: 10px;
    background: rgb(241, 241, 241);
    border-radius: 4px;
    color: #000;
}

.txt-login {
    display: block;
    margin: 10px auto 30px auto;
    text-align: center;
}

.form-group {
    width: 100%;
    display: block;
    margin: 15px auto;
}

.img-form {
    width: 35px;
    display: inline-block;
    margin: 10px 20px;
    padding: 0 15px 0 0;
    border-right: 1px solid #000;
}

.txt-form {
    display: inline-block;
    position: absolute;
    margin: 17px -6px;
    font-size: 0.9em;
}

.form-control {
    width: 100%;
    display: block;
    margin: 10px auto;
}

.form-control label {
    font-size: 0.9em;
    margin: auto 20px;
}

.form-control input {
    font-family: Open Sans;
    width: 85%;
    display: block;
    margin: 5px auto;
    padding: 6px;
    border: none;
    background: none;
    border-bottom: 1px solid #000;
    font-size: 0.8em;
    color: #000;
    outline: none;
}

.form-control button {
    font-family: Open Sans;
    width: 92%;
    display: block;
    margin: 30px auto 20px auto;
    padding: 8px;
    border: 1px solid #000;
    background: #000;
    font-size: 0.9em;
    border-radius: 3px;
    color: #fff;
    outline: none;
    cursor: pointer;
}

@media only screen and (max-width: 600px) {
    #login {
        width: 100%;
        height: 100%;
        display: block;
        margin: 0;
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background: url(../img/sssss.jpeg) center fixed;
        background-position: 10% 5%;
        background-size: cover;
        filter: brightness(50%);
    }

    .login {
        font-family: Open Sans;
        width: 85%;
        height: auto;
        display: block;
        position: absolute;
        margin: 10px auto;
        left: 0;
        right: 0;
        padding: 10px;
        background: rgba(255,255,255, 0.7);
        border-radius: 4px;
        color: #000;
    }
    
    .txt-login {
        display: block;
        margin: 10px auto 30px auto;
        text-align: center;
    }
    
    .form-group {
        width: 100%;
        display: block;
        margin: 15px auto;
    }
    
    .img-form {
        width: 35px;
        display: inline-block;
        margin: 10px 20px;
        padding: 0 15px 0 0;
        border-right: 1px solid #000;
    }
    
    .txt-form {
        display: inline-block;
        position: absolute;
        margin: 17px -6px;
        font-size: 0.9em;
    }
    
    .form-control {
        width: 100%;
        display: block;
        margin: 10px auto;
    }
    
    .form-control label {
        font-size: 0.9em;
        margin: auto 20px;
    }
    
    .form-control input {
        font-family: Open Sans;
        width: 85%;
        display: block;
        margin: 5px auto;
        padding: 6px;
        border: none;
        background: none;
        border-bottom: 1px solid #000;
        font-size: 0.8em;
        color: #000;
        outline: none;
    }
    
    .form-control button {
        font-family: Open Sans;
        width: 92%;
        display: block;
        margin: 30px auto 20px auto;
        padding: 8px;
        border: 1px solid #000;
        background: #000;
        font-size: 0.9em;
        border-radius: 3px;
        color: #fff;
        outline: none;
        cursor: pointer;
    }
}