.form {
    background: rgba(255,255,255,0.2);
    /*width: 400px;*/
    margin: 120px auto;
}
/*阴影*/
.fa {
    display: inline-block;
    top: 27px;
    left: 6px;
    position: relative;
    color: #ccc;
}

.has-feedback .form-control-feedback {
    top: 20px;
    right: 0;
}

input[type="text"], input[type="password"] {
    padding-left: 26px;
}
.form-group{
    width:99%;
}