@charset "UTF-8";
body {
  background-color: gray;

  background-size: cover;
}
 
#wrap {
  width: 960px;
  margin: auto;
  background-color: white;
}
 
header {
  padding: 40px;
  height: 80px;
  background-repeat: repeat;
  font-family: "Noto Sans JP", sans-serif;
}
 
nav {
  padding: 8px 40px;
  background-color: black;
  color: white; 
  transition-property: background-color;
  transition-duration: .5s;
}
nav:hover {
  background-color: dimgray;
}
main {
  padding: 40px;
  height : 400px;
}

main p {
    font-size: 20px;
    font-weight: bold;
    font-family: "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, Osaka, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
    text-align: center;
  }
 
footer {
  padding: 40px;
  height: 40px;
  background-color : black;
  color: white;
  background-repeat: no-repeat;
  background-size: 200px 50px;
  background-position: center bottom;

  nav:hover{
    background-color: dimgray;
  }
  .expansion {
    width: 500px;
    height: 300px;
    overflow: hidden;
  }
  .expansion img {
    width: 100%;
    transition: transform .5s;
  }
  
  .expansion img:hover {
    transform: scale(1.1);
  }