<button class="cp_button11">button</button>

.cp_button11 {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 160px;
  margin: 0.4em;
  padding: 1em;
  cursor: pointer;
  text-decoration: none;
  color: #ec407a;
  background: transparent;
  border: 1px solid #ec407a;
  border-radius: 0;
  box-shadow: 0 0 1px rgba(0, 0, 0, 0);
  transition: background-color 0.3s;
  transform: translateZ(0);
}
.cp_button11:before {
  position: absolute;
  top: -16px;
  right: -16px;
  bottom: -16px;
  left: -16px;
  content: '';
  border: 4px solid rgba(236,64,122,0.5);
  transition-duration: 0.3s;
  transition-property: top right bottom left;
  opacity: 0;
}
.cp_button11:hover:before {
  top: -8px;
  right: -8px;
  bottom: -8px;
  left: -8px;
  opacity: 1;
}
.cp_button11:active {
  color: #ffffff;
  background-color: #ec407a;
}
.cp_button11:active:before {
  top: -17px;
  right: -17px;
  bottom: -17px;
  left: -17px;
}
.cp_button11:hover,
.cp_button11:focus {
  color: #ec407a;
  border: 1px solid #ec407a;
}