[css] Align <div> elements side by side

I know this is a rather simple question, but I can't figure it out for the life of me. I have two links which I've applied a background image to. Here's what it currently looks like (apologies for the shadow, just a rough sketch of a button):

However, I want those two buttons to be side by side. I can't really figure out what needs to be done with the alignment.

Here's the HTML

<div id="dB"}>
    <a href="http://notareallink.com" title="Download" id="buyButton">Download</a> 
</div>
<div id="gB">
    <a href="#" title="Gallery" onclick="$j('#galleryDiv').toggle('slow');return false;" id="galleryButton">Gallery</a>     
</div>

Here's the CSS

#buyButton {
    background: url("assets/buy.png") 0 0 no-repeat;
    display:block;
    height:80px;
    width:232px;
     text-indent:-9999px;
}
#buyButton:hover{
width: 232px;
height: 80px;
background-position: -232px 0;
}
#buyButton:active {
width: 232px;
height: 80px;
background-position: -464px 0;
}

#galleryButton {
    background: url("images/galleryButton.png") 0 0 no-repeat;
    display:block;
    height:80px;
    width:230px;
     text-indent:-9999px;
}
#galleryButton:hover{
width: 230px;
height: 80px;
background-position: -230px 0;
}
#galleryButton:active {
width: 230px;
height: 80px;
background-position: -460px 0;
}

.section {
  display: flex;
}

.element-left {
  width: 94%;
}

.element-right {
  flex-grow: 1;
}

<div class="section">
  <div id="dB" class="element-left" }>
    <a href="http://notareallink.com" title="Download" id="buyButton">Download</a>
  </div>
  <div id="gB" class="element-right">
    <a href="#" title="Gallery" onclick="$j('#galleryDiv').toggle('slow');return false;" id="galleryButton">Gallery</a>
  </div>
</div>

or

.section {
  display: flex;
  flex-wrap: wrap;
}

.element-left {
  flex: 2;
}

.element-right {
  width: 100px;
}

<div class="section">
  <div id="dB" class="element-left" }>
    <a href="http://notareallink.com" title="Download" id="buyButton">Download</a>
  </div>
  <div id="gB" class="element-right">
    <a href="#" title="Gallery" onclick="$j('#galleryDiv').toggle('slow');return false;" id="galleryButton">Gallery</a>
  </div>
</div>

keep it simple

<div align="center">
<div style="display: inline-block"> <img src="img1.png"> </div>
<div style="display: inline-block"> <img src="img2.png"> </div>
</div>

Beware float: left…

…there are many ways to align elements side-by-side.

Below are the most common ways to achieve two elements side-by-side…

Demo: View/edit all the below examples on Codepen

Basic styles for all examples below…

Some basic css styles for parent and child elements in these examples:

.parent {
  background: mediumpurple;
  padding: 1rem;
}
.child {
  border: 1px solid indigo;
  padding: 1rem;
}

Using the float solution my have unintended affect on other elements. (Hint: You may need to use a clearfix.)

html

<div class='parent'>
  <div class='child float-left-child'>A</div>
  <div class='child float-left-child'>B</div>
</div>

css

.float-left-child {
  float: left;
}

html

<div class='parent'>
  <div class='child inline-block-child'>A</div>
  <div class='child inline-block-child'>B</div>
</div>

css

.inline-block-child {
  display: inline-block;
}

Note: the space between these two child elements can be removed, by removing the space between the div tags:

html

<div class='parent'>
  <div class='child inline-block-child'>A</div><div class='child inline-block-child'>B</div>
</div>

css

.inline-block-child {
  display: inline-block;
}

html

<div class='parent flex-parent'>
  <div class='child flex-child'>A</div>
  <div class='child flex-child'>B</div>
</div>

css

.flex-parent {
  display: flex;
}
.flex-child {
  flex: 1;
}

html

<div class='parent inline-flex-parent'>
  <div class='child'>A</div>
  <div class='child'>B</div>
</div>

css

.inline-flex-parent {
  display: inline-flex;
}

html

<div class='parent grid-parent'>
  <div class='child'>A</div>
  <div class='child'>B</div>
</div>

css

.grid-parent {
  display: grid;
  grid-template-columns: 1fr 1fr
}