如何删除这些部分之间的空间？

-1

据我所知，我还没有做错任何事情。我正在学校项目中制作一个.PSD模板，在HTML/CSS/JS中完全一样。我已添加我的CSS。如何删除这些部分之间的空间？

HTML：

<div class="center"> 

     <div class="services col-lg-3 col-md-3"> 
     more div's above ...</div> 
     <div class="services col-lg-3 col-md-3"> 
      <img class=serviceimg src="img/raket.png" /> 
      <p class=deeltitel2>Rocket services</p> 
      <p class=tekst2><?php include 'main/inc/mintekst.php'; ?></p> 
     </div> 
    </div> 
</section> 
<!--Here is nothing--> 
<section id="section3"> 
    <h1 class="titel">MEET OUR BEAUTIFULL TEAM </BR> -</h1> 
    <p class="tekst">We are a small teasm of designers, who help brands with big ideas.</p> 
    <div class="center"> 
     <div class="circle col-lg-3 col-md-3"></div> 
     <div class="circle col-lg-3 col-md-3"></div> 
     <div class="circle col-lg-3 col-md-3"></div> 
     <div class="circle col-lg-3 col-md-3"></div> 
</section>

CSS：

* { 
    margin:    0; 
    padding:   0; 
    outline:   0; 
    text-decoration: none; 
} 

/*Body*/ 
a:link { 
    text-decoration: none; 
    color:    #fff 
} 
a:visited { 
    text-decoration: none; 
    color:    #FFF; 
} 
/*Sections general*/ 
section { 
    width:    100%; 
    height:    100vh; 
    font-family:  'Titillium Web', sans-serif; 
    font-weight:  400; 
    margin-bottom:  0; 
}