.login{margin: top:50%;}
.glyphicon {
    top: 0;
}
.bao{margin-top: 20px;margin-bottom: 20px;margin-left:0px;margin-right:0px;}

.input-group .form-control:not(:first-child):not(:last-child), .input-group-addon:not(:first-child):not(:last-child), .input-group-btn:not(:first-child):not(:last-child) {
    border-bottom-right-radius: 4px;
    border-top-right-radius: 4px;
}