h3 {
    color: #1874CD;
}

body {
    /*background: url(img/4.jpg) no-repeat;*/
    background-size:cover;
    font-size: 16px;
}  

.form {
    background: rgba(255,255,255,0.2);
    width:400px;
    margin:200px auto;
    border:1px solid #363636;
    border-radius: 10px;
}  

#login_form {
    display: block;
}  

 #register_form {
    display: none;
}  

.fa {
    display: inline-block;
    top: 27px;
    left: 6px;
    position: relative;
    color: #ccc;
}  

input[type="text"],input[type="password"] {
    padding-left:26px;
}  

.checkbox {
    padding-left:21px;
}