body {
  background-image: url(../../images/dog.jpg);
  background-repeat: repeat;
  background-position: center;
  /* padding: 10px; */
}
h1,
h2,
h3,
h4,
p,
div {
  padding: 10px;
  border: 8px ridge rgb(211 220 50 / 0.9);
}

h1 {
  /* box-sizing: content-box; 初期値はこれこれはガチコンテンツ（文字など）だけの箱。パディングとボーダーは含めない */
  box-sizing: border-box; /*padding と borderを含む。*/
  color: #4b0d27;
  background-color: beige;
  /* margin: 10px 5% 50px 5%; */
  text-align: center;
  /* width: 90%; */
  height: 240px;
  width: 400px;
  margin-left: auto;
  margin-right: auto;
  border: solid 50px #000;
}
h2 {
  color: darkgreen;
  background-image: url(../../images/momo.jpg);
  background-size: auto 100%;
  margin: 5px 5% 0px 5%;
}
h3 {
  background-image: url(../../images/akipassport.png);
  background-size: auto 100%;
  margin: 0px 5% 5px 5%;
}
h4 {
  color: crimson;
}

p {
  color: cyan;
}

div {
  background-color: chocolate;
  margin: 5px;
}

div.mddiff {
  color: white;
  background-color: black;
}
div.mddiff h2 {
  color: white;
  background-color: black;
  background-image: none;
}