@charset "UTF-8";


.cssgrid640{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(1fr, 1fr));
  grid-auto-rows: 1fr;
  grid-gap: 0.8em;
  border: 1px solid #ddd;
  padding: 0.8em;
  margin: 0 0 2em;
}

.cssgrid640 > div{
  background:#000;
  color:  #fff;               /* 文字色F */
  overflow: auto;
  min-width: 0;
  padding: 1em;
}

@media screen and (min-width:480px) { 
    /*　画面サイズが480pxからはここを読み込む　*/
.cssgrid640{grid-template-columns: repeat(auto-fit, minmax(1fr, 1fr));  }
}


@media screen and (min-width:768px) and ( max-width:1023px) {
    /*　画面サイズが768pxから1024pxまではここを読み込む　*/
.cssgrid640{grid-template-columns: repeat(auto-fit, minmax(1fr, 1fr));  }
}

@media screen and (min-width:1024px) {
    /*　画面サイズが1024pxからはここを読み込む　*/
.cssgrid640{grid-template-columns: 1fr 1fr;}
}