* {
  box-sizing: border-box;
}

html,
body {
  height: 100vh;
  margin: 0;
  font-size: 1rem;
  font-family:'Courier New', Courier, monospace;
  background-image: url(../backgrounds/sky.jpg);
  background-size:contain;
  background-attachment: fixed;
}

img {
  max-width: 100%;
}

main {
    margin: 0 auto;
    width: 900px;
}

#grid {
    display: grid; 
    grid-template-columns: repeat(2, 1fr); 
    grid-template-rows: repeat(2, 1fr); 
    gap: 10px; 
}

button {
  width: 50px; /* set dimensions */
  height: 50px;
  background: url('../icons/l12-icon-folder.gif') no-repeat center/contain;
  border: none;
  padding: 0;

}
button:hover {
  background-image: url('../icons/la12-icon-folder.gif');
}

.container {
  text-align: center;
  padding-top: 10px;
  min-height:500px;
  border-radius: 10px;
  background-color: #ffffff70;
  box-shadow: inset 0 1px 0px #ffffff, inset 0 -1px 0px #b4b4b4, 0 2px 2px rgba(0, 0, 0, 0.2);
}