main.css

@import url('https://fonts.googleapis.com/css?family=Raleway');

html {
    font-family: 'Raleway', sans-serif;
    text-align: center;
}

a {
    text-decoration: none;
}

.item {
    border: 1px solid lightblue;
    font-weight: bold;
    text-align: center;
    padding: 15px;
  }

  .item a {
    color: lightseagreen;
  }

  .item:hover {
      background-color: gainsboro;
  }

.grid-container {
  display: grid;
  grid-template-columns: repeat(3, auto);
  grid-template-rows: repeat(6, auto);
  grid-auto-rows: 50px;
  grid-auto-columns: 45px;
  grid-gap: 5px;
}

.container {
    top: 5%;
    position: absolute;
    left: 25%;
    right: 0;
    bottom: 0;
    max-width: 50%;
}

@media (max-width: 500px) and (orientation : portrait) {
    .grid-container {
        grid-template-columns: repeat(2, auto);
    }
    .container {
        top: 1%;
        left: 20%;
        max-width: 60%;
    }
}