aside { width: 100%; height: 320px; }
#box,#button { max-width: 100%;max-height: 320px; margin: 0 auto; text-align: center; 
  -webkit-transition: opacity 1s;
  -moz-transition: opacity 1s;
  -o-transition: opacity 1s;
  transition: opacity 1s;}
#box img { max-width: inherit; max-height: inherit;margin-top: inherit; }

@media screen and (min-width: 768px){
  body { min-width: 768px; height: 1024px; }
  aside { height: 480px; }
  #button { height: 480px; }
  #box { max-height: 480px; }
}
@media screen and (min-width: 1024px){
  body {min-width: 1024px; height: 1920px;}
  aside {height: 600px;}
  #button { height: 600px; }
  #box { max-height: 600px; }
}
aside { position: relative; }
/*#left-arrow,#right-arrow { position: absolute; top: 50%; color: white; }
#left-arrow { left: 20px;}
#right-arrow { right: 20px; }

#left-arrow:hover, #right-arrow:hover { filter: invert(.5); }
*/

/*-------------------------
#slider{
  position: relative;
  height: 1000px;
  list-style-type: none;
}

.slide{
  position: absolute;
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
  opacity: 0;
  z-index: 1;

  -webkit-transition: opacity 1s;
  -moz-transition: opacity 1s;
  -o-transition: opacity 1s;
  transition: opacity 1s;
}

.showing{
  opacity: 1;
  z-index: 2;
}

*/