CSS 圆角六边形按钮

.lngbtn {
	position: relative;
	width: 150px;
	height: 50px;
	margin: 50px;
	color: #FFFFFF;
	background-color: #f4d046;
	text-align: center;
	line-height: 48px;
    padding: 16px;
	font-weight: bold;
}



.lngbtn:before {
    content:"";
    position: absolute;
    right: 100%;
    top:0px;
    width:0px;
    height:0px;
    border-top:25px solid transparent;
    border-right:30px solid #f4d046;
    border-bottom:25px solid transparent;
}

.lngbtn:after {
    content:"";
    position: absolute;
    left: 100%;
    top:0px;
    width:0px;
    height:0px;
    border-top:25px solid transparent;
    border-left:30px solid #f4d046;
    border-bottom:25px solid transparent;
}

<a href="#" class="lngbtn">Get to know us</a>

.hex {
  position: relative;
  height: 100px;
  min-width: 100px;
  padding: 12px 24px;
  margin: 4px;
  float: left;
  font-weight: bold;
  font-size: 20px;
  text-align: center;
  color: white;
}
.hex svg {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0px;
  left: 0px;
  z-index: -1;
}
path {
  fill: rgb(251, 208, 0);
}
.hex.border path {
  stroke: red;
  stroke-width: 4;
}
span {
  display: block;
  margin-top: 50px;
  padding: 8px;
  transform: translateY(-50%);
}

<div class='hex'>
  <svg viewBox='0 0 100 100' preserveAspectRatio='none'>
    <path d='M27,7 
             L72,7  Q76,7 78,11 
             L95,46 Q97,50 95,54 
             L78,91 Q76,95 72,95
             L28,95 Q24,95 22,91
             L5,54  Q3,50 5,46
             L22,11 Q24,7 28,7z' vector-effect='non-scaling-stroke' />
  </svg>
  <span>Some text</span>
</div>

<div class='hex'>
  <svg viewBox='0 0 100 100' preserveAspectRatio='none'>
    <path d='M27,7 
             L72,7  Q76,7 78,11 
             L95,46 Q97,50 95,54 
             L78,91 Q76,95 72,95
             L28,95 Q24,95 22,91
             L5,54  Q3,50 5,46
             L22,11 Q24,7 28,7z' vector-effect='non-scaling-stroke' />
  </svg>
  <span>Some lengthy text
  without line break.</span>
</div>

<div class='hex border'>
  <svg viewBox='0 0 100 100' preserveAspectRatio='none'>
    <path d='M27,7 
             L72,7  Q76,7 78,11 
             L95,46 Q97,50 95,54 
             L78,91 Q76,95 72,95
             L28,95 Q24,95 22,91
             L5,54  Q3,50 5,46
             L22,11 Q24,7 28,7z' vector-effect='non-scaling-stroke' />
  </svg>
  <span>Some very lengthy text</span>
</div>

<div class='hex border'>
  <svg viewBox='0 0 100 100' preserveAspectRatio='none'>
    <path d='M27,7 
             L72,7  Q76,7 78,11 
             L95,46 Q97,50 95,54 
             L78,91 Q76,95 72,95
             L28,95 Q24,95 22,91
             L5,54  Q3,50 5,46
             L22,11 Q24,7 28,7z' vector-effect='non-scaling-stroke' />
  </svg>
  <span>Some very lengthy text
  <br>with line break.</span>
</div>

.hex {
  position: relative;
  height: 100px;
  min-width: 300px;
  padding: 12px 24px;
  margin: 4px;
  float: left;
}
.hex svg {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0px;
  left: 0px;
}
path {
  fill: rgb(251, 208, 0);
}
text {
  font-family: Arial;
  font-weight: bold;
}

<div class='hex'>
  <svg viewBox='0 0 300 100' preserveAspectRatio='none'>
    <a xlink:href='#'>
      <path d='M52,7 
             L248,7  Q253,7 258,11 
             L295,46 Q297,50 295,54 
             L258,91 Q253,95 248,95
             L52,95 Q48,95 42,91
             L5,54  Q3,50 5,46
             L42,11 Q48,7 52,7z' vector-effect='non-scaling-stroke' />
      <text fill='white' text-anchor='middle' x='150' y='55'>Get to know us</text>
    </a>
  </svg>
</div>