body{
    background: url(../img/fondo6.jpg) no-repeat center center fixed;
    background-size: cover;
}
.mensaje{
    width: 100%;
    max-width: 350px;
    margin: auto;
    margin-top: 20px;
    text-align: left;
    padding: 6px;
    color: red;
}

.modal-content{
   /* background-color: #3b4652; original */
   
	background-color: #78899b;
    opacity: .90;
    padding: 0 20px;
    box-shadow: 0px 0px 10px #848484;
}

.main-section{
    margin: 0 auto;
    margin-top: 25%;
    padding: 0;
}

.user-img{
    margin-top: -50px;
    margin-bottom: 35px;
}

.user-img img{
    width: 100px;
    height: 100px;
    box-shadow: 0px 0px 3px #848484;
    border-radius: 50%;
}

.form-group input{
    height: 42px;
    font-size: 18px;
    border: 0;
    padding-left: 54px;
    border-radius: 5px;
}
.form-group::before{
    font-family: "Font Awesome\ 5 Free";
    position: absolute;
    left: 28px;
    font-size: 22px;
    padding-top: 4px;
}

.form-group#user-group::before{
    content: "\f007";
}
.form-group#contraseña-group::before{
    content: "\f023";
}
button{
    width: 60%;
    margin: 5px 0 25px;
}