HTML, CSS: Cannot reposition my dropdown list - html

Question

I'm trying to build a website. But for some reason I am not able to reposition my dropdown list(CSS). Need some help. I need to move that dropdown list to the center.
HTML Code:
<header>
<h1 id="my_cycle_head">MY CYCLE</h1>
<ul id="main_navbar">
<li>
Home
</li>
<li class="dropdown">
<a class="dropbtn" style="margin-left: -40px; z-index: -1">Rent</a>
<div class="dropdown-content">
Mountain Bikes
Hybrid Bikes
Road Bikes
City Bikes
</div>
</li>
<li>
FAQ's
</li>
<li>
About
</li>
</ul>
</header>
CSS Code:
body {
font-family: 'Open-sans', sans-serif, Helvetica;
background-color: #f9f9f9;
text-align: center;
box-sizing: border-box;
}
.dropdown {
position: relative;
}
.dropdown-content {
display: none;
min-width: 200px;
right: 1;
position: absolute;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
}
.dropdown-content a {
display: block;
}
.dropdown:hover .dropdown-content {
display: block;
background-color: #6ab47b;
}
#my_cycle_head {
text-align: center;
float: left;
margin-left: 50px;
font-weight: normal;
}
#main_navbar {
text-align: center;
margin: 0 auto;
float: right;
margin-top: 25px;
}
#main_navbar li {
list-style-type: none;
display: inline-block;
min-width: 5em;
}
#main_navbar li a {
text-decoration: none;
color: white;
font-size: 1.2em;
font-weight: normal;
text-align: center;
overflow: hidden;
}
header {
background-color: #6ab47b;
height: 95px;
width: 100%;
float: left;
padding-right: 30px;
margin-left: -20px;
margin-top: -20px;
padding-top: 20px;
color: white;
}
Thank you in advance.

Answer 1

You can keep your menu floated to right. In order to center your drop down menu you should do the followings
remove the "margin-left: -40px; inline style from all <a> elements.
insert the following two lines to your .dropdown-content class
right: 50%;
transform: translate(50%,0);

Answer 2

In your CSS the dropdown is floated to right. Just remove it, Dropdown will be in the center.
#main_navbar {
text-align: center;
margin: 0 auto;
/*float: right;*/
margin-top: 25px;
}

Answer 3

accepted
replace this css with what you have for #main_navbar > li > a:
#main_navbar > li > a {
display:inline-block;
margin-left: 15px; /* This is when the drop down box appears */
position: relative;
}
and add this to your css codes:
#main_navbar > li > {
text-align:center;
}

Answer 4

try with this below code it may help you.
body {
font-family: 'Open-sans', sans-serif, Helvetica;
background-color: #f9f9f9;
text-align: center;
box-sizing: border-box;
}
header {
background-color: #6ab47b;
height: 95px;
width: 100%;
float: left;
padding-right: 30px;
margin-left: -20px;
margin-top: -20px;
padding-top: 20px;
color: white;
}
#my_cycle_head {
text-align: center;
float: left;
margin-left: 50px;
font-weight: normal;
}
.dropdown-content {
position: absolute;
z-index: 1000;
display: none;
float: left;
min-width: 160px;
padding: 5px 0;
margin: 2px 0 0 -50px;
font-size: 14px;
text-align: center;
list-style: none;
background-color: #6ab47b;
box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
background-clip: padding-box;
border: 1px solid #ccc;
border: 1px solid rgba(0,0,0,.15);
border-radius: 4px;
-webkit-box-shadow: 0 6px 12px rgba(0,0,0,.175);
}
#main_navbar{
float : right;
}
#main_navbar>li {
float: left;
padding : 10px;
list-style-type : none;
}
#main_navbar li a {
text-decoration: none;
color: white;
font-size: 1.2em;
font-weight: normal;
text-align: center;
overflow: hidden;
}
.dropdown>.dropdown-content {
list-style-type : none;
}
.dropdown>.dropdown-content>li {
padding : 5px;
border-bottom : 1px solid #fff;
}
.dropdown>.dropdown-content>li:last-child {
border-bottom : none;
}
.dropdown>.dropdown-content>li:hover {
background : white;
color : #6ab47b !important;
}
.dropdown:hover .dropdown-content{
display : block
}
<header>
<h1 id="my_cycle_head">MY CYCLE</h1>
<ul id="main_navbar">
<li>
Home
</li>
<li class="dropdown">
Rent <span class="caret"></span>
<ul class="dropdown-content">
<li>Mountain Bikes</li>
<li>Hybrid Bikes</li>
<li>Something else here</li>
<li>Road Bikes</li>
<li>City Bikes</li>
</ul>
</li>
<li><a href="faq.html" >FAQ's</a></li>
<li><a href="about.html" >About</a>
</li>
</ul>
</header>