Can't center fixed form on unbounce platform - css

Question

I'm working on the unbounce landing page platform. Overall, it's really awesome and makes A/B testing pretty easy. It's more or less just drag and drop, but you're able to add css, html, javascript, etc.
Anyway, I'm working on creating a fixed signup area on the bottom of the screen (should boost conversions), but I'm having some troubles. The signup box is created within the wysiwyg dashboard, and from what I see it just builds the CSS for you, as you move sliders, change colors and such.
I'm able to make the entire signup area float right to the bottom, but I can't get the signup box to stay centered. I can use margins and positioning, but not the align: center function.
I've tried doing margin-left: auto; margin-right: auto as well as text-align: center; but it does absolutely nothing!
When changing the size of the screen, it just will not stay centered. But here's the kicker; the text has no problem centering with just width: 100%.. The signup box doesn't seem to respect any wrapper and I'm thinking this might be the problem.
This is all the CSS I'm using to create this fixed section:
#lp-pom-box-214 {
top: auto !important;
display:block;
position:fixed;
margin-left: auto;
margin-right: auto;
bottom:0px;
width: 100%;
align: center;
}
#lp-pom-form-51 {
top: auto !important;
display:block;
width: 100%;
position:fixed;
bottom: 25px;
margin-left: 26%;
}
#lp-pom-text-211 {
top: auto !important;
display:block;
position:fixed;
bottom:75px;
width: 100%;
}
Thanks a TON in advance!! This client is really good to me, so I want to do a good job for them. I'm not a great coder, but I'm very good at marketing so feel free to give me a shout if you need help in that arena :) That's the best way I know how to give back to whoever helps me out (or anyone else in the community for that matter).
Thanks again.

Answer 1

You can't adjust the position of a fixed positioned element in this way.
A fixed position element is positioned relative to the viewport, or the browser window. The viewport doesn't change when the window is scrolled, so a fixed positioned element will do exactly as the name implies and remain fixed in it's assigned position. To position a fixed element you use the properties top, right, bottom, and left
If you want to keep it as a fixed positioned element you can vertically and horizontally center it on the page by setting top and left to 50% so as the left-top corner of the container is centered within the page, you can then use margin-top and margin-left with negative values to compensate for half of the width and height of the element to achieve true center within the center of your container.

Answer 2

Something like this?
if yes check this code
css
.fixed-bottom {
position:fixed;
left:0;
bottom:0;
padding:10px 0;
background:#CCC;
width:100%;
}
.fixed-bottom h1 {
text-align:center;
}
#lp-pom-button-52 {
display: block;
z-index: 61;
width: 175px;
height: 54px;
line-height: 54px;
behavior: url(/PIE.htc);
border-radius: 8px;
background-color: #ff0000;
background: -webkit-linear-gradient(#ff0000,#e60000);
background: -moz-linear-gradient(#ff0000,#e60000);
background: -ms-linear-gradient(#ff0000,#e60000);
background: -o-linear-gradient(#ff0000,#e60000);
background: linear-gradient(#ff0000,#e60000);
box-shadow: inset 0px 1px 0px #ff4c4c,inset 0 -1px 2px #b30000;
text-shadow: 1px 1px #5c0000;
-pie-background: linear-gradient(#ff0000,#e60000);
color: #fff;
border-style: solid;
border-width: 3px;
border-color: #333333;
font-size: 24px;
font-weight: bold;
font-family: arial;
text-align: center;
background-repeat: no-repeat;
float:left;
margin:0 0 0 10px;
}
#lp-pom-form-51 .lp-pom-form-field input[type=text] {
border-style: solid;
border-width: 10px;
border-color: #002c77;
}
a {
color: #ff0000;
text-decoration: none;
}