* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #ececec;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.main-visual {
  width: 100%;
  max-width: 450px;
}

.main-visual img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}