index.php

<?php /* Default Page Template */ ?>

<?php
 get_header();
?>
<?php
 while (have_posts()) : the_post(); 
?>
        <div class="parallax-container valign-wrapper">
            <div class="parallax">
                <!--show hero image -->
                <?php $hero = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'full'); ?>
                <!-- get the alt image else take the title as a alt of the image-->
                <?php 
                     $alt=get_the_post_thumbnail_caption();
                     if ($alt != get_the_post_thumbnail_caption()) {
                         $alt = get_the_title();
                     }
                 ?>
                <img src="<?php echo $hero['0'];?>" alt="<?php echo $alt?> ">
            </div>
        </div>
        <h1 class="center">
            <?php  echo the_title();?>
        </h1>
        <div class="container">
            <div class="row">
                <div class="col s12 offset-l2 l8">
                    <?php  the_content();?>
                </div>
            </div>
        </div>
<?php 
endwhile;
?>
<?php
get_footer();
?>