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html - Why is there vertical scroll on the main container?

I am very much confused here. Since the body is 100% (width/height) and main-container is also 100% (width/height), why is there vertical scroll?

I created a jsFiddle to explain the situation: http://jsfiddle.net/dcnnvgs1/1/

body,
html {
  width: 100%;
  height: 100%;
  font-family: "Trebuchet MS !important";
  background-color: #00b3b3;
}

.main-container {
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  height: 100%;
  width: 100%;
  box-sizing: border-box;
}

.main-header {
  background-color: #099;
  height: 10%;
}

.main-footer {
  background-color: #099;
  height: 10%;
}

.main-content {
  background-color: #fff;
  height: 100%;
}
<body>
  <div class="main-container">
    <div class="main-header">HEADER</div>
    <div class="main-content">jecechejbhcbjbcjrbjb bbjbhbbk</div>
    <div class="main-footer">FOOTER</div>
  </div>
</body>
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by (71.8m points)

the body tag by default has a margin depend on the browser as example in chrome its margin:8pxyou have to rest it via

body{
  margin:0;
}

see updated fiddle


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