html {
  font-family: "MS UI Gothic";
  font-size: 13px;
  line-height: 13px;
  image-rendering: pixelated;
  background-color: #81ea5d;
}

#container {
  display: flex;
  margin: auto;
  margin-top: 40px;
}

.mainbox {
  background-color: #ecffe7;
  box-shadow: 0px 10px 10px 15px #e7ffe9;
  margin-top: -37px;
  width: 620px;
  height: 660px;
}