change searc form layout

could it be that your theme is adding extra p tags? you can add p:empty { display:none; } in your theme style.css

also, do you have a sample link for us to see?

I inspected your site using chrome inspect elements and I think your theme sets form elements to be wider

e.g. (theme style.css at around line 3080 then noticed width:60%)

input[type="text"],
textarea,
select,
.wpcf7 select,
.cmsms-form-builder select,
.search_line input {
	border:1px solid #e8e8e8;
	background-color:#fefefe;
	line-height:28px;
	width:60%;
	height:38px;
	padding:5px;
	margin:0 0 3px;
	overflow:hidden;
	-webkit-transition:border-color .3s ease-in-out;
	-moz-transition:border-color .3s ease-in-out;
	-ms-transition:border-color .3s ease-in-out;
	-o-transition:border-color .3s ease-in-out;
	transition:border-color .3s ease-in-out;
}