/* HEADER */ .sePage .sePageMain { margin-top: 0px; }
section {
 border: none;
}
<section class="no-border">...</section>
<section class="no-border">...</section>

.no-border {
 border: none;
}
<section class="no-border">
 <h1>Section 1</h1>
 <p>Content goes here</p>
</section>

<section class="no-border">
 <h1>Section 2</h1>
 <p>More content goes here</p>
</section>