<a href="#" class="cp_btn">button</a>
a.cp_btn {
display: block;
width: 160px;
padding: 0.8em;
text-align: center;
text-decoration: none;
color: #EC407A;
border: 2px solid #EC407A;
border-radius: 3px;
transition: .4s;
}
a.cp_btn:hover {
background: #EC407A;
color: #fff;
}