HTML not centering - html

Question

I have the following HTML:
<div class="flag_container">
<div class="flag_1">
<img class="flag_img_1" src="../images/gb.png"></img>
<div class="speaker_1">
</div>
</div>
<div class="flag_2">
<img class="flag_img_2" src="../images/at.png"></img>
<div class="speaker_2">
</div>
</div>
<div class="flag_3">
<img class="flag_img_3" src="../images/de.png"></img>
<div class="speaker_3">
</div>
</div>
<div class="flag_4">
<img class="flag_img_4" src="../images/nl.png"></img>
<div class="speaker_4">
</div>
</div>
</div>
and CSS:
.flag_img_1{
width:160px;
height:80px;
cursor:pointer;
}
.flag_img_1:hover+.speaker_1{
display:block;
}
.speaker_1{
width:100px;
height:100px;
background-color:red;
display:none;
position:absolute;
margin-left:170px;
margin-top:-90px;
}
.flag_img_2{
width:160px;
height:80px;
cursor:pointer;
}
.flag_img_2:hover+.speaker_2{
display:block;
}
.speaker_2{
width:100px;
height:100px;
background-color:green;
display:none;
position:absolute;
margin-left:170px;
margin-top:-90px;
}
.flag_img_3{
width:160px;
height:80px;
cursor:pointer;
}
.flag_img_3:hover+.speaker_3{
display:block;
}
.speaker_3{
width:100px;
height:100px;
background-color:blue;
display:none;
position:absolute;
margin-left:170px;
margin-top:-90px;
}
.flag_img_4{
width:160px;
height:80px;
cursor:pointer;
}
.flag_img_4:hover+.speaker_4{
display:block;
}
.speaker_4{
width:100px;
height:100px;
background-color:orange;
display:none;
position:absolute;
margin-left:170px;
margin-top:-90px;
}
.flag_container{
padding:80px 0;
}
.flag_1{
padding-left:406px;
}
.flag_2{
float:left;
padding-left:163px;
padding-top:40px;
}
.flag_3{
float:right;
padding-right:163px;
padding-top:40px;
}
.flag_4{
padding-top:160px;
padding-left:406px;
}
Which creates the following display:
and on hover:
Where the blue square is a placeholder for an image.
This all works fine.
I want to make the display responsive, so when the screen gets smaller, the flags take a central formation like:
My problem is, it will not stay central, but will keep a fixed position in relation to the left. Here is my CSS:
.flag_container{
width:80%;
margin:auto;
}
.flag_1{
width:auto;
padding:0;
margin-bottom:20px;
margin-left:20px;
margin-right:20px;
}
.flag_2{
width:auto;
padding:0;
margin-bottom:20px;
margin-left:20px;
margin-right:20px;
}
.flag_3{
width:auto;
padding:0;
margin-bottom:20px;
margin-left:20px;
margin-right:20px;
}
.flag_4{
width:auto;
padding:0;
margin-bottom:20px;
margin-left:20px;
margin-right:20px;
}
.agendaHeading{
float:left;
font-size:120%;
}
.flag_img_1:hover+.speaker_1{
display:none;
}
.flag_img_2:hover+.speaker_2{
display:none;
}
.flag_img_3:hover+.speaker_3{
display:none;
}
.flag_img_4:hover+.speaker_4{
display:none;
}
I have tried every combination I can think of, and read many posts but it does not work. I suspect it is something to do with the structure of my divs preventing it from working as I want?
An example of CSS where I have managed to centre a div in the way I am trying to here is:
.box1{
width:85%;
margin:auto;
border:1px solid #ffffff;
float:none;
height:50px;
}
But this does not work.
Apologies for the long post/amount of code, but to demonstrate my problem I have to include it all.

Answer 1

I think the problem is that you are using pixels and no % in your paddings.
Did you tried to use % instead of fixed pixels in your padding-left,top and right on you css of .flag_*? I've bee playing a little bit with your code and using % gives you a more efficient way of organize the divs on a resized screen.