body {
  display: grid;
  justify-content: center;
  background-image: url(checkerblue.png);
  margin: 0px;
}

.study-box {
  background-color: antiquewhite;
  padding: 15px;
  width: 900px;
}

@media only screen and (max-width: 1000px) {
  .study-box {width: 90vw;}
}