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		/**
* Reset
* - Prevents Themes and other Plugins from applying their own styles to our full screen search
*/
#full-screen-search,
#full-screen-search button,
#full-screen-search button.close,
#full-screen-search form,
#full-screen-search form div,
#full-screen-search form div input,
#full-screen-search form div input.search {
    font-family: Arial, sans-serif;
    background:none;
    border:0 none;
    border-radius:0;
    -webkit-border-radius:0;
    -moz-border-radius:0;
    float:none;
    font-size:100%;
    height:auto;
    letter-spacing:normal;
    list-style:none;
    outline:none;
    position:static;
    text-decoration:none;
    text-indent:0;
    text-shadow:none;
    text-transform:none;
    width:auto;
    visibility:visible;
    overflow:visible;
    margin:0;
    padding:0;
    line-height:1;
    box-sizing:border-box;
    -webkit-box-sizing:border-box;
    -moz-box-sizing:border-box;
    -webkit-box-shadow:none;
    -moz-box-shadow:none;
    -ms-box-shadow:none;
    -o-box-shadow:none;
    box-shadow:none;
    -webkit-appearance:none;
    transition: none;
    -webkit-transition: none;
    -moz-transition: none;
    -o-transition: none;
    -ms-transition: none;
}

/**
* Background
*/
#full-screen-search {
    visibility: hidden;
    opacity: 0;
    z-index: 999998;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.95);

    /**
    * Add some CSS3 transitions for showing the Full Screen Search
    */
    transition: opacity 0.5s linear;
}

/**
* Display Full Screen Search when Open
*/
#full-screen-search.open {
    /**
    * Because we're using visibility and opacity for CSS transition support,
    * we define position: fixed; here so that the Full Screen Search doesn't block
    * the underlying HTML elements when not open
    */
    position: fixed;
    visibility: visible;
    opacity: 1;
}

/**
* Search Form
*/
#full-screen-search form {
    position: relative;
    width: 100%;
    height: 100%;
}

/**
* Close Button
*/
#full-screen-search button.close {
    position: absolute;
    z-index: 999999;
    top: 20px;
    right: 20px;
    font-size: 30px;
    font-weight: 300;
    color: #999;
    cursor: pointer;
}

/**
* Search Form Div
*/
#full-screen-search form div {
    position: absolute;
    width: 50%;
    height: 100px;
    top: 50%;
    left: 50%;
    margin: -50px 0 0 -25%;
}

/**
* Search Form Input Placeholder Color
*/
#full-screen-search form div input::-webkit-input-placeholder { 
    font-family: Arial, sans-serif;
    color: #ccc;
}
#full-screen-search form div input:-moz-placeholder { 
    font-family: Arial, sans-serif;
    color: #ccc;
}
#full-screen-search form div input::-moz-placeholder { 
    font-family: Arial, sans-serif;
    color: #ccc;
}
#full-screen-search form div input:-ms-input-placeholder { 
    font-family: Arial, sans-serif;
    color: #ccc;
}

/**
* Search Form Input
*/
#full-screen-search form div input {
    width: 100%;
    height: 100px;
    background: #eee;
    padding: 20px;
    font-size: 40px;
    line-height: 60px;
}

// When the document is ready...
jQuery( document ).ready( function( $ ) {

    // ... display the Full Screen search when:
    // 1. The user focuses on a search field, or
    // 2. The user clicks the Search button
    $( 'form[role=search] input, form[role=search] button' ).on( 'focus, click', function( event ) {
        // Prevent the default action
        event.preventDefault();

        // Display the Full Screen Search
        $( '#full-screen-search' ).addClass( 'open' );

        // Focus on the Full Screen Search Input Field
        $( '#full-screen-search input' ).focus();
    } );

    // Hide the Full Screen search when the user clicks the close button
    $( '#full-screen-search button.close' ).on( 'click', function( event ) {
        // Prevent the default event
        event.preventDefault();

        // Hide the Full Screen Search
        $( '#full-screen-search' ).removeClass( 'open' );
    } );

} );

<div id="full-screen-search">
	<button type="button" class="close" id="full-screen-search-close">X</button>
	<form role="search" method="get" action="<?php echo home_url( '/' ); ?>" id="full-screen-search-form">
		<div id="full-screen-search-container">
			<input type="text" name="s" placeholder="<?php _e( 'Search' ); ?>" id="full-screen-search-input" />
		</div>
	</form>
</div>
		
		
		
<input type="submit" class="search-submit" value="Search">