.voltarTopo {
  display: block;
  overflow: hidden;
  width: auto;
  z-index: 90;
  position: fixed;
  bottom: 20px;
  right: 20px;
  top: auto;
  left: auto;
  font-family: sans-serif;
  font-size: 1em;
  color: #fff;
  text-decoration: none;
  text-shadow: 0 1px 0 #333;
  font-weight: bold;
  padding: 21px 19px;
 
  background: none repeat scroll 0 0 #37632A;
  
  -webkit-background-origin: border;
  -moz-background-origin: border;
  -icab-background-origin: border;
  -khtml-background-origin: border;
  -o-background-origin: border;
  background-origin: border;
  -webkit-background-clip: padding-box;
  -moz-background-clip: padding-box;
  -icab-background-clip: padding-box;
  -khtml-background-clip: padding-box;
  -o-background-clip: padding-box;
  background-clip: padding-box;
  border: 1px solid #ccc;
}

#dynamic-to-top span {
  display: block;
  overflow: hidden;
  width: 14px;
  height: 12px;
  background: url("../images/up.png")no-repeat center center;
}

#dynamic-to-top, #dynamic-to-top:active, #dynamic-to-top:focus, #dynamic-to-top:hover {
  outline: none;
}

#dynamic-to-top:hover {
  background: #4D893A;
  cursor: pointer;
}