元素上边距似乎没有改变

Question

我有一些文字，下面有一个按钮。无论我将上边距更改为什么，按钮仍然粘在文本的底部。

我试图在文本和按钮之间留一个小间隙。

这是一个 Jsfiddle：http://jsfiddle.net/24bk2t78/

 @import url(http://fonts.googleapis.com/css?family=Nunito:300);


.homethree a    { text-decoration: none; }
sup  { font-size: 36px; font-weight: 100; line-height: 55px; }

.button
{
 margin-top:30%!important;
 text-transform: uppercase;
 letter-spacing: 2px;
 text-align: center;
 color: #0C5;
 font-size: 24px;
 font-family: "Nunito", sans-serif;
 font-weight: 300;
 position:relative;
 padding: 20px 0;
 width: 220px;
 height:30px;
 background: #0D6;
 border: 1px solid #0D6;
 color: #FFF;
 overflow: hidden;
 transition: all 0.5s;
}

.button:hover, .button:active 
{
  text-decoration: none;
  color: #0C5;
  border-color: #0C5;
  background: #FFF;
}

.button span 
{
 
  padding-right: 0;
  
  transition: padding-right 0.5s;
}

.button span:after 
{
  content: ' ';  
  
  right: -18px;
  opacity: 0;
  width: 10px;
  height: 10px;
 

  background: rgba(0, 0, 0, 0);
  border: 3px solid #FFF;
  border-top: none;
  border-right: none;

  transition: opacity 0.5s, top 0.5s, right 0.5s;
  transform: rotate(-45deg);
}

.button:hover span, .button:active span 
{
  padding-right: 30px;
}

.button:hover span:after, .button:active span:after 
{
  transition: opacity 0.5s, top 0.5s, right 0.5s;
  opacity: 1;
  border-color: #0C5;
  right: 0;
  top: 50%;
}

<div class="row text-center homethree">
    <div class="col-md-4">
        <h4 class="service-heading">A Range of Classes</h4>
        <p class="text-muted">WE TEACH CHILDRENS CLASSES, FAMILY GROUPS & ADULTS.</p>
     <a href="#" class="button"><span>page 1</span></a>
    </div>
    <div class="col-md-4">
        <h4 class="service-heading">Passionate Instructors</h4>
        <p class="text-muted">ALL OUR CLASSES ARE TAUGHT BY PASSIONATE, MOTIVATIONAL & INSPIRING INSTRUCTORS.</p>
        <a href="#" class="button"><span>page 2</span></a>
    </div>
    <div class="col-md-4">
        <h4 class="service-heading">Friendly Team</h4>
        <p class="text-muted">NEW MEMBERS ARE ALWAYS WELCOME. TWO FREE LESSONS FOR ALL.</p>
  <a href="#" class="button"><span>page 3</span></a>
    </div>
</div>

Answer 1

问题是 <a> 标签是 inline 元素。将它们更改为 inline-block 或 block 样式元素将使您的边距正确应用。

.button {
    display: inline-block;
}

更多信息：The Difference Between “Block” and “Inline”

旁注，为什么不使用 <button> 标签而不是 <a>？他们会更合适。

Answer 2

试试这个演示 Fiddle

.button{
    float:left;
    margin-top:0;
     }
.col-md-4
 {
    float:left;
    width:100%
 }

元素上边距似乎没有改变

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