Different width divs in the same row - html

Question

I'm trying to put 3 divs(with different widths respectively : 10%,70% & 20%) in the same row but the middle one always go full width of the page.
Here is my code:
#left-bar {
width: 10%;
background-color: #FF0000;
}
#middle-bar {
width: 70%;
background-color: #6600FF;
}
#right-bar {
width: 20%;
background-color: #99FF99;
}
<div class="row">
<div id="left-bar"></div>
<div id="middle-bar"></div>
<div id="right-bar"></div>
</div>

Answer 1

By default div is a block level element that's why they aren't in the same row.
You have a few options to fix this:
option with CSS flexbox:
.row {
display: flex;
width: 100%
}
.row>div {
/*demo purposes */
height: 30px;
}
#left-bar {
flex: 0 10%;
background-color: #F00;
}
#middle-bar {
flex: 1;
background-color: #60F;
}
#right-bar {
flex: 0 20%;
background-color: #9F9;
}
<div class="row">
<div id="left-bar"></div>
<div id="middle-bar"></div>
<div id="right-bar"></div>
</div>
(old options)
option with display:inline-block
.row {
/*fix inline-block gap*/
font-size: 0;
}
.row>div {
display: inline-block;
/*demo purposes */
height: 30px;
}
#left-bar {
width: 10%;
background-color: #F00;
}
#middle-bar {
width: 70%;
background-color: #60F;
}
#right-bar {
width: 20%;
background-color: #9F9;
}
<div class="row">
<div id="left-bar"></div>
<div id="middle-bar"></div>
<div id="right-bar"></div>
</div>
option with display:table-[cell]
.row {
display: table;
width: 100%
}
.row>div {
display: table-cell;
/*demo purposes */
height: 30px;
}
#left-bar {
width: 10%;
background-color: #F00;
}
#middle-bar {
width: 70%;
background-color: #60F;
}
#right-bar {
width: 20%;
background-color: #9F9;
}
<div class="row">
<div id="left-bar"></div>
<div id="middle-bar"></div>
<div id="right-bar"></div>
</div>

Answer 2

The table-cell option actually doesn't work in some internet explorer versions. But the same result can be achieved with the property float:
#left-bar{
width:10%;
background-color: #FF0000;
}
#middle-bar{
width:70%;
background-color: #6600FF;
}
#right-bar{
width:20%;
background-color: #99FF99;
}
.row > div {float:left;}
<div class="row">
<div id="left-bar">a</div>
<div id="middle-bar">b</div>
<div id="right-bar">c</div>
</div>

Answer 3

#left-bar{
width:10%;
background-color: #FF0000;
float:left;
}
#middle-bar{
width:70%;
background-color: #6600FF;
float:left;
}
#right-bar{
width:20%;
background-color: #99FF99;
float:left;
}
If that doesn't work, please provide more html and css because the problem will be somewhere else. Also, verify that you have heights set for your divs.