body {
  margin: 0;
  width: 100%;
  background-color: #fff;
}

.wrapper {
  max-width: 750px;
  margin: 0 auto;
  text-align: center;
}

img {
  vertical-align: bottom;
  max-width: 100%;
}


.cva {
  position: relative;
}

.cva > .button {
  position: absolute;
  bottom: 7%;
  left: 0;
  right: 0;
  margin: auto;
  max-width: 90%;
}