.activity-visual {
  position: relative;
  width: min(100%, 760px);
  margin: 0 auto 46px;
  padding: 24px 30px;
  overflow: hidden;
  border: 1px solid #dce7f0;
  border-radius: 24px;
  background:
    radial-gradient(circle at 50% 50%, rgba(8, 116, 201, .12), transparent 66%),
    linear-gradient(145deg, #fff, #eef5fa);
  box-shadow: 0 16px 42px rgba(0, 45, 90, .1);
}

.activity-visual::after {
  content: "";
  position: absolute;
  right: -55px;
  bottom: -80px;
  width: 220px;
  height: 220px;
  border: 24px solid rgba(8, 116, 201, .07);
  border-radius: 50%;
}

.activity-visual img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  margin: auto;
  object-fit: contain;
}

@media (max-width: 600px) {
  .activity-visual {
    margin-bottom: 32px;
    padding: 14px;
    border-radius: 18px;
  }
}