为什么内容以100%的宽度消失

Why my .topnav, .mainnav and my .content divs the content escapes them?

从行跳到页数限制时,我该如何做?

它们已经是100%的宽度

* {
  list-style: none;
  text-decoration: none;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  height: 100%;
}

.container {
  display: grid;
  grid-template-columns: 280px 1fr;
  width: 100%;
  height: 100%;
  position: fixed;
}

.leftbar {
  background: #1D2126;
  height: 100%;
  width: 100%;
  grid-template-rows: 100px 1fr;
}

.rightbar {
  display: grid;
  grid-template-rows: 100px 1fr;
  width: calc(100%-280px);
  height: 100%;
  position: fixed;
  margin-left: 280px;
}

.header {
  display: grid;
  grid-template-rows: 30px 70px;
  width: 100%;
  height: 100%;
}

.topnav {
  background: #1A1E23;
}

.mainnav {
  background: #1D2126;
}

.content {
  background: #21252B;
  overflow-y: scroll;
}
<div class="container">
  <div class="leftbar">
    <div class="logo"><img src="https://www.csgoroll.com/en/assets/logo.png" width="80%"></div>
    <div class="chat">
      <div class="chatbox">

      </div>
      <div class="chatsend">

      </div>
    </div>
  </div>
  <div class="rightbar">
    <div class="header">
      <div class="topnav">aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</div>
      <div class="mainnav">d</div>
    </div>
    <div class="content">
      asdaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaassssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
    </div>
  </div>
</div>