trouble creating 100vh page with footer and sidebar

Question

I am trying to make a content slider with a chatbox to the side and a footer stuck to the bottom.

Here is a diagram of what I am trying to achieve:

The problem with below code is that the chatbox is the height of the page. I want the chat box to stop at the footer so that it is the height of the page -60px.

And here is what I have so far:

body {
  margin: 0;
}

.wrapper {
  background: #95a5a6;
  display: table;
  height: 100vh;
  width: 100%;
}

.wrapper-inner {
  display: table-cell;
  padding-left: 300px;
  padding-bottom: 60px;
  vertical-align: middle;
  text-align: center;
}

.chatbox {
  background: #bdc3c7;
  min-height: 100%;
  position: absolute;
  overflow-x: hidden;
  overflow-y: auto;
  width: 300px;
  z-index: 2;
}

.footer {
  background: #2c3e50;
  bottom: 0px;
  height: 60px;
  position: absolute;
  width: 100%;
  z-index: 1;
}

<div class="wrapper">
  <div class="chatbox"></div>
  <div class="wrapper-inner">Content</div>
</div>
<div class="footer"></div>

https://jsfiddle.net/bjxsyve7/4/

Answer 1

Here's a simplified version using only flex and calc():

body {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
}

.chatbox {
  flex: 0 0 300px;
  height: calc(100vh - 60px);
  overflow-y: auto;
  background-color: #bdc3c7;
}

.content {
  flex: 1;
  background-color: #95a5a6;
}

.footer {
  flex-basis: 100%;
  height: 60px;
  background: #2c3e50;
}

<div class="chatbox"></div>
<div class="content">Content</div>
<div class="footer"></div>

jsFiddle