.grid-container {
  display: grid;
  grid-template-rows: 240px;
  grid-auto-rows: 240px;
  grid-template-columns: repeat(auto-fit,minmax(240px,240px));
  padding: 10px;
  width:80%;
  height:100%;
}
.grid-item {  
  border: 1px solid rgba(0, 0, 0, 0.8);
  padding: 20px;
  margin:10px;
  font-size: 20px;
  text-align: center;

}