horizontal scrollbar showing even when overflow is hidden - css

Question

I'm running into a problem in my website, where an horizontal scrollbar is always showing even when i add overflow-x: hidden to the body, html elements. Instead of hiding the scrollbar, another scrollbar is added vertically and now i have two vertical scrollbars!
This happened because i have a centered navigation and add to set a child div of that same navigation, to 100% of the viewport width. Checked the developer tools in chrome and that div is going some pixels to the right.
Anyway, since overflow didn't work, i tried to change the values of the calc() function to subtract those pixels but the horizontal scrollbar is still there.
Here is my code:
<div id="container">
<ul class="nav">
<li>home</li>
<li>
destinations
<div>
<div class="nav-column">
</div>
<div class="nav-column">
</div>
<div class="nav-column">
</div>
<div class="nav-column">
</div>
<div class="nav-column">
</div>
</div>
</li>
<li>about</li>
<li>contact</li>
</ul>
</div>
And the css:
body,html {
background-color: white;
border: 0;
outline: 0;
margin: 0;
padding: 0;
max-width: 100%;
overflow-x: hidden;
}
#container {
display: block;
margin: 0 auto;
text-align: center;
position: relative;
width: 100%;
}
.nav {
cursor: default;
display: inline-block;
height: 125px;
position: relative;
top: 50px;
width: auto;
-ms-flex-pack: center;
-ms-display: -ms-flexbox;
}
.nav,
.nav a,
.nav ul,
.nav li,
.nav div {
border: none;
padding: 0;
margin: 0;
outline: none;
}
.nav a {
text-decoration: none;
}
.nav li {
list-style: none;
}
.nav > li {
display: block;
float: left;
}
.nav > li > a {
display: block;
color: black;
font-family: 'Oswald', sans-serif;
font-size: 1.2em;
font-weight: 500;
text-transform: uppercase;
height: 30px;
padding: 0 20px;
position: relative;
z-index: 510;
-webkit-transition: all .3s ease;
-moz-transition: all .3s ease;
-o-transition: all .3s ease;
-ms-transition: all .3s ease;
transition: all .3s ease;
}
.nav li:hover a {
background: black;
color: white;
}
.nav > li > div {
border: 1px solid black;
display: inline-block;
color: black;
position: absolute;
top: 30px;
left: calc(-50vw + 50%);
width: 100vw;
opacity: 0;
overflow: hidden;
visibility: hidden;
background: white;
z-index: 500;
-webkit-transition: all .3s ease .5s;
-moz-transition: all .3s ease .5s;
-o-transition: all .3s ease .5s;
-ms-transition: all .3s ease .5s;
transition: all .3s ease .5s;
}
.nav li:hover > div {
opacity: .7;
visibility: visible ;
overflow: hidden;
}
.nav .nav-column {
background-color: white;
float: left;
text-align: left;
top: -30px;
padding: 2%;
position: relative;
width: 15%;
}
.nav .nav-column h3 {
color: #d1a559;
font-family: Orator Std, IrisUPC, sans-serif;
font-weight: 900;
margin: 20px 0 10px 0;
text-decoration: underline ;
}
.nav .nav-column li {
padding-left: 0;
font-family: Palatino linotype, Rockwell;
}
.nav .nav-column li a {
background: white;
color: black;
display: block;
}
.nav .nav-column li a:hover {
background: #d1a559;
color: white;
-webkit-transition: all .1s ease;
-moz-transition: all .1s ease;
-o-transition: all .1s ease;
-ms-transition: all .1s ease;
transition: all .1s ease;
}
#media (max-width:1420px) {
.Thumbnails {
float: none;
}
}
#media (max-width: 950px) {
.nav li:hover > div {
background-color: white;
opacity: 1;
}
.nav .nav-column {
position: relative;
width: 20%;
}
.nav .nav-column li {
list-style: none;
}
}
#media (max-width: 700px) {
.nav li:hover > div {
background-color: white;
left: 0;
opacity: 1;
width: 100%;
}
.nav .nav-column {
float: none;
}
}
.colAbout {
display: block;
float: none;
}
.span_1_of_3 {
width: 70%;
}
#media (max-width: 530px) {
.nav {
display: none;
text-align: left;
height: 150px;
top: 0;
padding: 0;
margin: 0;
position: relative;
z-index: 999;
}
.nav li {
float: none;
left: 0;
}
.nav li:hover > div {
opacity: 1;
top: 113px;
}
.nav > li > a {
border-right: none;
display: block;
left: 0;
}
/*Div contendo responsive button*/
#menu {
border: 1px solid black;
color: black;
cursor: pointer;
display: block;
font-size: 1.3em;
left: 0;
margin: 5%;
position: relative;
text-align: center;
z-index: 540;
width: 1.4em;
}
#container {
left: 0;
display: block;
padding: 0;
position: relative;
width: 100%;
}
ul {
width: 100%;
list-style: none;
}
}
#media (min-width: 530px) {
#menu {
display: none;
}
}
And a fiddle example

Answer 1

If you just want to hide the scrollbar:
#container {
overflow: hidden!important;
}

Answer 2

I encountered the same issue. I still don't know the root cause, but setting overflow to "-moz-hidden-unscrollable" seems to hide the scrollbar.
.container {
overflow: -moz-hidden-unscrollable
}

Answer 3

I have checked your CSS. To prevent the scrollbar from being displayed, you should comment out two CSS properties: position: relative; top: 34px;
.nav {
cursor: default;
display: inline-block;
height: 125px;
width: auto;
-ms-flex-pack: center;
-ms-display: -ms-flexbox;
}