Edit in JSFiddle

*{
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

#header{
  padding: 8px 32px;
  margin-bottom: 16px;
  background-color: #8bc34a;
}

#content{
  width: 70%;
  padding: 0 32px;
  margin-bottom:16px;
  float: left;
}

#content a{
  color: #03a9f4;
  padding: 4px 0;
  text-decoration: none;
  border-bottom: 1px solid rgba(3, 169, 244, 0.25);
}

#content a:hover{
  color: #f44336;
  border-color: rgba(244, 67, 54, 0.25);
}

#sidebar{
  width: 30%;
  padding: 0 8px;
  float: right;
}

#footer{
  background-color: #8bc34a;
  clear: both;
  padding: 4px 32px;
}

.soc-btn{
  display:inline-block;
  border-radius: 4px;
  border: 2px solid;
  padding: 0 8px;
  line-height: 2;
  text-align: center;
  text-decoration: none;
}

.soc-btn:hover{
  color: #fff;
}

.soc-btn-fb{
  color: blue;
}

.soc-btn-fb:hover{
 background-color: blue;
}

.soc-btn-vk{
  color: green;
}

.soc-btn-vk:hover{
 background-color: green;
}

.soc-btn-gp{
  color: red;
}

.soc-btn-gp:hover{
 background-color: red;
}
<div id="header">
  <span>Название сайта</span>
</div>
<div id="content">
  <p>_________ ____ _____ ____ <a href="#">______ ____ ____</a> ______ ______ ______ __ ______ _____ _______ ______ ______ __ ______ _____ </p>
  <p>_________ ____ ____ <a href="#">______ ____ ____</a> ______ ____ _______ ___________ _________ _______ ____ ______ __ ______ _____ ______ __ ______ _____ </p>
  <p>_________ ____ ____ <a href="#">______ ____ ____</a> ______ ____ _______ ___________ _________ _______ ____ ______ __ ______ _____ ______ __ ______ _____ </p>
  <p>
    <a href="#" class="soc-btn soc-btn-fb">fb</a>
    <a href="#" class="soc-btn soc-btn-vk">vk</a>
    <a href="#" class="soc-btn soc-btn-gp">g+</a>
  </p>
</div>
<div id="sidebar">
  <p>_________ ____ _____ ____ ______ ____ ____ ______ ______ ______ __ ______ _____ _______ ______ ______ __ ______ _____ </p>
  <p>
    <a href="#" class="soc-btn soc-btn-fb">fb</a>
    <a href="#" class="soc-btn soc-btn-vk">vk</a>
    <a href="#" class="soc-btn soc-btn-gp">g+</a>
  </p>
</div>
<div id="footer">
  <span>© 2017</span>
</div>