body {
    display: flex;
    width: 100%;
    margin: 0; /* 余白のリセット */
    padding: 0; /* 余白のリセット */
    flex-direction: column;
}

#top {
    margin:0;
    width: 100%;
    min-height: 100px;
    text-align: center;
    background-color: grey;
    flex: 1; /* これで親要素内で幅を占めるようになる */
    color:white;
    font-size:60px;
}
#contents-background{
    align-items: center;
    background-color:#1ABC9C;
    display:flex;
    flex-direction: column;
    gap:20px;
    width:100%;
    margin:0;
}
.item {
    width: calc(100% - 50px);
    background-color: white;
    border-radius: 20px;
    text-align: left;
    padding: 10px;
    box-sizing: border-box;
    align-items: center;
}

#contents-background h1 {
    margin: 0;
    font-size: 24px;
    color:black;
}

#contents-background a {
    font-size: 18px;
    color: blue;
    text-decoration: none;
}

#contents-background .content {
    font-size: 30px;
    margin: 10px 0;
    color:black;
  word-wrap: break-word;
}

#contents-background .memo {
    font-size: 15px;
    color:black;
  word-wrap: break-word;
}