Gravity Form user activation link.

Create a simple user activation popup using the WordPress default layout. Commonly the activation link is display in home page. I have simple CSS/JQUERY to set your activation page into simple popup. See codes below.

CSS codes:

.gf-activation #content {
    position: fixed;
    top: 0;
    margin: auto;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999999;
    text-align: center;
    background-color: rgba(0,0,0,0.5);
}
.gf-activation #content h2 {
    background-color: rgba(255,255,255,0.8);
    display: inline-block;
    padding: 20px;
    border-radius: 5px;
    margin: 0;
    max-height: 125px;
    position: absolute;
    left: 0;
    right: 0;
    width: 400px;
    margin: auto;
    top: 0;
    bottom: 0;
}
.gf-activation #content div,
.gf-activation #content p {
    display: none;
}
.gf-activation #content h2:after {
    content: 'Please check your email for your username and password';
    display: block;
    font-size: 14px;
    line-height: normal !important;
    padding-top: 20px;
}

jQuery( document ).ready( function( $ ){
	var getPostValue = function getPostValue(key) {
		var pageURL = decodeURIComponent(window.location.search.substring(1)),
			URLvar = pageURL.split('&'),
			keyName,
			i;
	 
		for (i = 0; i < URLvar.length; i++) {
			keyName = URLvar[i].split('=');
	 
			if (keyName[0] === key) {
				return keyName[1] === undefined ? true : keyName[1];
			}
		}
	};
	if( getPostValue( 'page' ) == 'gf_activation' ){
		// #main is the main ID wrapper of your page div element. Try to change the #main base on your div wrapper element
		$( '#main' ).addClass( 'gf-activation' );
		$( document ).click( function( e ){
			var target = e.target;
			var targetid = target.id;
			if( targetid == 'content' ){
				$( '.gf-activation #' + targetid ).fadeOut();
			}
		});
	}
});

Output: