body {
  font-family: sans-serif;
  padding: 2rem;
  background-color: #f5f5f5;
}
header {
  background-color: #f7b946;
  color: white;
  padding: 1rem;
  margin-bottom: 1rem;
  box-shadow: 5px 5px 10px rgba(0,0,0,0.3);
}
main {
  display:flex;
}
footer {
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
  color: #777;
}
.content {
  padding: 1rem;
  width:70%;
}
.sidebar {
  padding: 1rem;
  background-color: #f7b946;
  width: 30%;
  box-shadow: 5px 5px 10px rgba(0,0,0,0.3);
}
.tile {
  background-color: white;
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid #ddd;
  box-shadow: 5px 5px 10px rgba(0,0,0,0.3);
}
.header-title {
  position: relative;
  margin: 0;
  padding: 0;
  text-align: center;
  width:100%;
  height: 300px;
}
.header-title img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.menu {
  background-color: white;
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid #ddd;
  box-shadow: 5px 5px 10px rgba(0,0,0,0.3);
}
.menu a {
  display: block;         /* 各リンクを縦に並べる */
  padding: 10px;          /* 内側の余白 */
  color: #333;            /* 文字色 */
  text-decoration: none;  /* 下線を消す */
  background-color: #f0f0f0; /* 背景色 */
  border-bottom: 1px solid #ccc; /* 下に線を引く */
}
.menu a:hover {
  background-color: #ddd; /* ホバー時の背景色 */
  color: #000;            /* ホバー時の文字色 */
}