Trying to create a circular menu - html

Question

I'm trying to create a circular menu with radials using html and css, but the white borders are not built well. And it is not look fine in google chrome (not like a circle). I need get the last white radial, between item5 and item6. I have tried the next code:
DEMO
HTML
<div id="menu">
<div class="item1 item">
<div class="content">Solución Aula Digital</div>
</div>
<div class="item2 item">
<div class="content">Live Streaming</div>
</div>
<div class="item3 item">
<div class="content">Social Tecal Online</div>
</div>
<div class="item4 item">
<div class="content">FlexScorn</div>
</div>
<div class="item5 item">
<div class="content">Video On Demand</div>
</div>
<div id="wrapper6">
<div class="item6 item">
<div class="content">Video Colaboración</div>
</div>
</div>
<div id="center">
</div>
</div>
CSS
#menu {
background: #aaa;
position: relative;
width: 300px;
height: 300px;
margin: 0 auto;
overflow: hidden;
border-radius: 155px;
-moz-border-radius: 90px;
-webkit-border-radius: 90px;
}
#center {
position: absolute;
left: 60px;
top: 60px;
width: 180px;
height: 180px;
z-index: 10;
background: #FFFFFF;
border-radius: 100px;
-moz-border-radius: 100px;
-webkit-border-radius: 100px;
}
#center a {
display: block;
width: 100%;
height: 100%
}
.item {
background: #aaa;
overflow: hidden;
position: absolute;
transform-origin: 100% 100%;
-moz-transform-origin: 100% 100%;
-webkit-transform-origin: 100% 100%;
transition: background .5s;
-moz-transition: background .5s;
-webkit-transition: background .5s;
-o-transition: background .5s;
-ms-transition: background .5s;
border: 3px solid #FFFFFF;
}
.item:hover {
background: #eee
}
.item1 {
z-index: 1;
transform: rotate(60deg);
-moz-transform: rotate(60deg);
-webkit-transform: rotate(60deg);
width: 134px;
height: 134px;
}
.item2 {
z-index: 2;
transform: rotate(120deg);
-moz-transform: rotate(120deg);
-webkit-transform: rotate(120deg);
width: 150px;
height: 150px;
}
.item3 {
z-index: 3;
transform: rotate(180deg);
-moz-transform: rotate(180deg);
-webkit-transform: rotate(180deg);
width: 150px;
height: 150px;
}
.item4 {
z-index: 4;
transform: rotate(240deg);
-moz-transform: rotate(240deg);
-webkit-transform: rotate(240deg);
width: 152px;
height: 152px;
}
.item5 {
z-index: 5;
transform: rotate(300deg);
-moz-transform: rotate(300deg);
-webkit-transform: rotate(300deg);
width: 151px;
height: 151px;
}
.item6 {
border: none;
position: absolute;
z-index: 6;
transform: rotate(-30deg);
-moz-transform: rotate(-30deg);
-webkit-transform: rotate(-30deg);
width: 140px;
height: 140px;
}
#wrapper6 {
position: absolute;
width: 160px;
height: 160px;
/*overflow: hidden;*/
transform-origin: 100% 100%;
-moz-transform-origin: 100% 100%;
-webkit-transform-origin: 100% 100%;
/*border: 2px solid #FFFFFF;*/
}
.item1 .content {
left: 0px;
top: 17px;
transform: rotate(-60deg);
-moz-transform: rotate(-60deg);
-webkit-transform: rotate(-60deg);
}
.item2 .content {
left: -5px;
top: 31px;
transform: rotate(-59deg);
-moz-transform: rotate(-59deg);
-webkit-transform: rotate(-59deg);
}
.item3 .content {
left: -40px;
top: 8px;
transform: rotate(-237deg);
-moz-transform: rotate(-237deg);
-webkit-transform: rotate(-237deg);
}
.item4 .content {
left: -43px;
top: 4px;
transform: rotate(-240deg);
-moz-transform: rotate(-240deg);
-webkit-transform: rotate(-240deg);
}
.item5 .content {
left: -52px;
top: 7px;
transform: rotate(-247deg);
-moz-transform: rotate(-247deg);
-webkit-transform: rotate(-247deg);
}
.item6 .content {
left: 26px;
top: -3px;
transform: rotate(-29deg);
-moz-transform: rotate(-29deg);
-webkit-transform: rotate(-29deg);
}
.content, .content a {
width: 100%;
height: 100%;
text-align: center
}
.content {
position: absolute;
}
.content a {
line-height: 100px;
display: block;
position: absolute;
text-decoration: none;
font-family: 'Segoe UI', Arial, Verdana, sans-serif;
font-size: 12px;
/*text-shadow: 1px 1px #eee;
text-shadow: 0 0 5px #fff, 0 0 5px #fff, 0 0 5px #fff*/
}
.display-target {
display: none;
text-align: center;
opacity: 0;
}
.display-target:target {
display: block;
opacity: 1;
animation: fade-in 1s;
-moz-animation: fade-in 1s;
-webkit-animation: fade-in 1s;
-o-animation: fade-in 1s;
-ms-animation: fade-in 1s;
}
#keyframes fade-in {
from { opacity: 0 }
to { opacity: 1 }
}
#-moz-keyframes fade-in {
from { opacity: 0 }
to { opacity: 1 }
}
#-webkit-keyframes fade-in {
from { opacity: 0 }
to { opacity: 1 }
}
#-o-keyframes fade-in {
from { opacity: 0 }
to { opacity: 1 }
}
#-ms-keyframes fade-in {
from { opacity: 0 }
to { opacity: 1 }
}
I need get the six borders like this image :
Help, please!

Answer 1

Your border-radius was defined in px instead of %
JSfiddle
#menu {
-moz-border-radius: 100%;
-webkit-border-radius: 100%;
}

Answer 2

This is the reason it's not being a circle in Chrome:
border-radius: 155px;
-moz-border-radius: 90px;
-webkit-border-radius: 90px;
You're defining a different border radius for Webkit and Mozilla than for everyone else. Use the same value in all three styles.
Also:
border-radius: 50%;
...will get you a circle no matter the size of the element.