Background does not apply for h1 and floated image - css

Question

I have floated the image left with a class of logo. I apply a background color for h1 and the image but it does not appear for some reason. Why is this happening? I have floated the image because the text appears below the image not top of the image. Is there a way to deal with it?
JS Fiddle - https://jsfiddle.net/z8cw31j9/
#import url(http://fonts.googleapis.com/css?family=Niconne);
body {
background: #e6e3d7;
font-size: 16px;
}
header {
background: #b47941;
width: 95%;
padding-left: 1%;
margin: 0 auto;
}
.logo {
width: 12%;
height: 12%;
float: left;
background: green;
}
header h1 {
display: inline-block;
font: 300% 'Niconne', cursive;
line-height: 200%;
height: 0;
color: white;
margin-left: 2%;
background: blue;
}
.clear {
clear: both;
}
.search {
display: inline;
background: blue;
}
<div class="container">
<header>
<img class="logo" src="https://placehold.it/500x300">
<h1 class=""> Heading one </h1>
<input type="search">
<div class="clear"></div>
</header>
</div>

Answer 1

Actually background color was set successfully, but you can't see because of zero height:
header h1 {
height: 0;
}
#import url(http://fonts.googleapis.com/css?family=Niconne);
body{
background: #e6e3d7;
font-size: 16px;
}
header{
background: #b47941;
width: 95%;
padding-left: 1%;
margin: 0 auto;
}
.logo{
width: 12%;
height: 12%;
float: left;
background: green;
}
header h1 {
display: inline-block;
font:300% 'Niconne', cursive ;
line-height: 200%;
color: white;
margin-left: 2%;
background: blue;
}
.clear{
clear: both;
}
.search{
display: inline;
background: blue;
}
<div class="container">
<header>
<img class="logo" src="https://placehold.it/500x300" >
<h1 class=""> Heading one </h1>
<input type="search">
<div class="clear"></div>
</header>
</div>

Answer 2

header h1{...enter code here...}
remove height:0;

Answer 3

The color you applied to the img tag is actually there. It's just directly behind the image, so you can't see it. If you apply padding: 25px to the .logo class you'll see what I mean.
In terms of the h1, you've given it a height: 0, so there's no space to show the background color.

Answer 4

for your h1, the background is not working because you set the height of the element to 0, so there wouldn't be any color that will show up.
and as for your img, the background is not working because you have a image in front of it.
If you want to see the background for the img, you can add a padding for it