WordPress - Masonary Responsive Look for Blog Post

Create a page template like - "page-blog.php" post this file inside the theme files. "/wp-content/theme/yourtheme/page-blog.php"

<?php
/**
 * Template Name: Masonry Blog
 *
 * Blog Template
 *
 */
 ?>
<?php include_once( 'header.php' ); ?>
<!-- Start the Loop. -->
<div class="masonry">
  
<?php
$temp = $wp_query;
$wp_query= null;
$wp_query = new WP_Query();
$wp_query->query('posts_per_page=100'.'&paged='.$paged);
while ($wp_query->have_posts()) : $wp_query->the_post();
?>
<div class="item">

<a href="<?php the_permalink() ?>" rel="bookmark" title="Click to view: <?php the_title_attribute(); ?>">
<?php the_title(); ?></a>


<?php if ( has_post_thumbnail() ) {
 $size=75;
 ?>
 <a href="<?php the_permalink() ?>" rel="bookmark" title="Click to view: <?php the_title_attribute(); ?>">
<?php the_post_thumbnail( $size );  }  ?>
</a>

<?php the_excerpt(); ?>
<a href="<?php the_permalink() ?>" title="<?php the_title(); ?>" class="read_more_link">Read More</a>
</div>
<?php endwhile;?>
<?php $wp_query = null; $wp_query = $temp;?>
<!-- stop The Loop. -->
</div><!-- container -->
<?php get_footer(); ?>

CSS  Code - Put this below code in themes "Style.css"

.masonry {
    margin: 1.5em 0;
    padding: 0;
    -moz-column-gap: 1.5em;
    -webkit-column-gap: 1.5em;
    column-gap: 1.5em;
    font-size: .85em;
}

.item {
    display: inline-block;
    background: #fff;
    padding: 1em;
    margin: 0 0 1.5em;
    width: 100%;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-shadow: 2px 2px 4px 0 #ccc;
}

@media only screen and (min-width: 400px) {
    .masonry {
        -moz-column-count: 2;
        -webkit-column-count: 2;
        column-count: 2;
    }
}

@media only screen and (min-width: 700px) {
    .masonry {
        -moz-column-count: 3;
        -webkit-column-count: 3;
        column-count: 3;
    }
}

@media only screen and (min-width: 900px) {
    .masonry {
        -moz-column-count: 4;
        -webkit-column-count: 4;
        column-count: 4;
    }
}

@media only screen and (min-width: 1100px) {
    .masonry {
        -moz-column-count: 5;
        -webkit-column-count: 5;
        column-count: 5;
    }
}

@media only screen and (min-width: 1280px) {
    .wrapper {
        width: 1260px;
    }
}