.sidebar_fixed {
  position: sticky;
  top: 10px;
  color: red;
  height: 450px;
}

.sidebar_content {
  margin-bottom: 100px;
}

.new {
  height: 100px;
  background-color: white;
  border-color: blueviolet;
  border-width: 1px;
  border-style: solid;
  margin-top: 10px;
  margin-bottom: 10px;
  width: 80%;
}
.whatsnew {
  height: 100px;
  overflow: auto;
  border-color: #006AB7;
  border-width: 1px;
  border-style: solid;
  margin-top: 0px;
  margin-bottom: 10px;
  text-align: left;
  line-height: 1.5;
  font-family: "メイリオ", sans-serif;
  font-size: 1.0rem;
}