#oops {
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.box {
  padding: 27px;
  text-align: center;
  background: #fff;
}

.ttl {
  font-size: 4.5rem;
  font-weight: 700;
}

.txt {
  margin: 27px;
  font-size: 1.8rem;
  line-height: 1.5;
  color: var(--c-gray);
}

.btn {
  display: block;
  margin: auto;
  width: 180px;
  height: 45px;
  line-height: 45px;
  font-size: 1.6rem;
  color: var(--c-blue);
  background: var(--c-whisper);
  border-radius: 45px;
  transition: 180ms var(--timing-function);
}

@media (hover :hover) {
  .btn:hover {
    color: #fff;
    background: var(--c-blue);
  }
}