style.css

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

body {
    font-family: 'Roboto',sans-serif;
    background: url(img/mountain.jpg) no-repeat center center fixed;
    background-size: cover;

}

.main-section{
    margin: 0 auto;
    margin-top: 130px;
    padding: 0;
}

.modal-content{
 background-color: #3b4652;
 opacity: .90;
 padding: 0 20px;
 box-shadow: 0px 0px 4px #848484;
}
.user-img{
    margin-top:-50px;
    margin-bottom: 35px;
}
.user-img img {
    height:100px;
    width:100px;
    border-radius:6px;
    box-shadow: 0px 0px 2px #848484;
}

.form-group{
    margin-bottom: 25px;
}
.form-group input {
    height:42px;
    border-radius: 5px;
    border: 0;
    font-size: 18px;
    padding-left:54px;
}  
.form-group::before{
    font-family: 'Font Awesome\ 5 Free';
    content:"\f007";
    position:absolute;
    font-size: 22px;
    color:#555e60;
    left:28px;
    padding-top: 4px;

}
.form-group:last-of-type::before{
    content:"\f023";
}
button{
    width:40%;
    margin:5px 0 25px;
} 
.btn{
    background-color: #27c2a5;
    color:#fff;
    font-size: 19px;
    padding: 7px 14px;
    border-radius: 5px;
    border-bottom: 4px solid #219882;
}
.btn:hover,.btn:focus {
    background-color: #25a890;
    border-bottom:4px solid #25a890!important;

}
.forgot {
    padding: 5px 0 25px;
}
.forgot a {
    color:#c2fbfe;
}