I tried add cloud tag in side widget but seem not showing properly.

http://www.akuakultiva.com/news/

Thank you

Thanks

Indeed, WP core changed the markup a bit so the styling got trashed, no problem, add this CSS:

[class^="tag-link-"] {
	float: left;
	font-size: 12px;
	padding: 3px 7px;
	color: #555;
	text-shadow: 0 1px 0 rgba(256,256,256, 0.7);	
	background: #fafafa;
		background-image: -moz-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.05));
		background-image: -ms-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.05));
		background-image: -o-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.05));
		background-image: -webkit-linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.05));
		background-image: linear-gradient(top, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.05));
		background-repeat: repeat-x;
	
	margin: 0 8px 8px 0;
	border-bottom: 1px solid #e6e6e6;
	border-bottom: 1px solid rgba(0,0,0,0.05);

	-webkit-transition: all 0.15s ease-in-out;
	-moz-transition: all 0.15s ease-in-out;
	-o-transition: all 0.15s ease-in-out;
	-ms-transition: all 0.15s ease-in-out;
	transition: all 0.15s ease-in-out;
	border-radius: 2px;
}
[class^="tag-link-"]:hover{
	color: #fff;	
	text-shadow: 0 1px 0 rgba(0,0,0, 0.1);
	background-color: #9DD91F;
	border-bottom: 1px solid #d5d5d5;
	border-bottom: 1px solid rgba(0,0,0,0.05);	
}

I put the css in theme options but still got thrashed.

The title of tag cloud still not showing and seem overlapping with the widget under of it.

I can see the styling is now ok. To fix the bottom widget wrapping issue add this as well:

.widget {
    clear: both;
}
[class^="tag-link-"] + .widget {
    position: relative;
    top: 30px;
}

I would also add a title to the tag cloud so that it’s more distinguished.

I already put the title but never show up.
Please see this picture

return 'smallest=13&largest=13&number=25&orderby=name&unit=px';

$args['largest'] = 13;
$args['smallest'] = 13;
$args['unit'] = 'px';
$args['orderby'] = 'name';
return $args;