.main-box {
  width: 700px;
  margin: 0 auto;
}
.main-box ul {
  line-height: 1.8;
  list-style: none;
  padding-left: 0;
}
.proto-help {
  font-size: 0.8em;
  position: relative;
  height: 2em;
}
.proto-help a {
  position: absolute;
  right: 1em;
}