Just made a responsive breadcrumb to work with mybb, beware I'm a casual programmer and I may have left some mistakes. To get this to work I mixed up two breadcrumbs
The one using bootstrap & being responsive:
https://bootsnipp.com/snippets/featured/...readcrumbs
And the one using pure css (but not responsive):
https://codepen.io/arkev/pen/DzCKF
The final result is a pure css breadcrumb without bootstrap.
So now that I've credited everyone
let's start !
Go to mybb template
In global.css of your theme , find & replace breadcrumb css with this :
In navigation template, replace "nav" with this :
replace "nav_bit" with this :
In "nav_bit_active"
You may want to change some things with the last element of the breadcrumb but I don't (+css is taking care of removing the last arrow so.. i use the same code as nav_bit, it's needed because I count child in css, without the last arrow counting fails.)
I do not use nav_sep & nav_dropdown but I'll look into it to check what funny things can be achieved with it !
If you have any suggestion of modifications or error corrections I'll be glad to read it !
The one using bootstrap & being responsive:
https://bootsnipp.com/snippets/featured/...readcrumbs
And the one using pure css (but not responsive):
https://codepen.io/arkev/pen/DzCKF
The final result is a pure css breadcrumb without bootstrap.
So now that I've credited everyone

Go to mybb template
In global.css of your theme , find & replace breadcrumb css with this :
Code:
/** Breadcrumb **/
.breadcrumb {
/*centering*/
text-align:center;
display: inline-block;
overflow: hidden;
width:100%;
}
.breadcrumb a {
text-overflow: ellipsis;
min-width:5%;
max-width:10%;
text-decoration: none;
display: inline-block;
overflow: hidden;
white-space: nowrap;
float: left;
font-size: 12px;
line-height: 36px;
padding-left:30px;
padding-right:10px;
background: white;
color: #383838;
position: relative;
transition: all 0.3s;
}
.breadcrumb a:first-child {
text-overflow: none;
min-width:15px;
padding-left: 20px;
border-radius: 5px 0 0 5px; /*to match with the parent's radius*/
}
.breadcrumb a:nth-last-child(-n+2){
border-radius: 0 5px 5px 0; /*this was to prevent glitches on hover*/
padding-right: 20px;
max-width:100%;
width:100%;
}
/*hover/active styles*/
.breadcrumb a.active, .breadcrumb a:hover{
background: #dadada;
color:black;
}
.breadcrumb a:hover + span{
background: #dadada;
}
.breadcrumb span:last-child {
display: none;
}
.breadcrumb a.active:after, .breadcrumb a:hover:after {
background: #dadada;
}
/*adding the arrows for the breadcrumbs using rotated pseudo elements*/
.arrow {
display: inline-block;
float: left;
background: white;
color: #383838;
position:relative;
top: 1px;
right: 18px; /*half of square's length*/
/*same dimension as the line-height of .breadcrumb a */
height: 36px;
width:36px;
transform: scale(0.707) rotate(45deg);
z-index: 1;
box-shadow:
2px -2px 0 2px rgba(0, 0, 0, 0.4),
3px -3px 0 2px rgba(255, 255, 255, 0.1);
border-radius: 0 2px 0 100px;
transition: all 0.3s;
background: white;
margin-right:-36px;
}
.breadcrumb > * > a {
/* With less: .text-overflow(); */
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
#ptipoints{
display:block;
text-align:center;
min-width:0px;
}
/* === For phones =================================== */
@media screen and (min-width:340px){
#ptipoints{
display:block;
}
#ptipoints + span{
display:block;
}
.breadcrumb :nth-child(n+3){
display:none;
}
.breadcrumb a:nth-last-child(-n+2){
display:inline-block;
max-width:40%;
width:auto;
}
}
/* === For desktops ================================== */
@media screen and (min-width:670px){
#ptipoints{
display:none;
}
#ptipoints + span{
display:none;
}
.breadcrumb :nth-child(n+2){
display:inline-block;
}
.breadcrumb a:nth-last-child(-n+2){
display:inline-block;
max-width:40%;
width:auto;
}
}
/** END*/
In navigation template, replace "nav" with this :
Code:
<div class="breadcrumb">
{$nav}{$activesep}{$activebit}
</div>
replace "nav_bit" with this :
Code:
<a href="{$navbit['url']}">{$navbit['name']}</a>
<span class="arrow"></span>
In "nav_bit_active"
Code:
<a href="{$navbit['url']}">{$navbit['name']}</a>
<span class="arrow"></span>
You may want to change some things with the last element of the breadcrumb but I don't (+css is taking care of removing the last arrow so.. i use the same code as nav_bit, it's needed because I count child in css, without the last arrow counting fails.)
I do not use nav_sep & nav_dropdown but I'll look into it to check what funny things can be achieved with it !
If you have any suggestion of modifications or error corrections I'll be glad to read it !