How can I properly adjust margins in my css? - css

Question

I have a simple distributed system project which aims to develop airlines booking and purchase system. In this project, the main goal is to achieve proper functionalities, not to achieve best visuality. However, I have really basic problem due to my lack of experience in web design area.
Any kind of interest of you will be appreciated!
In my home page, I tried to draw an airplane layout but the problem is margins. I can not arrange properly the seats in between plane borders.
Demonstration of my ugly home.php:
Architecture of my home.php:
<div class="content">
...
<div class="airplane">
...
<div class="cockpit">...</div>
<ol class="fuselage">
<li class="row row--1">
<ol class="seats">
<li class="seat">...</li>
</ol>
</ol>
</ol>
</div>
</div>
Here is my CSS code:
div.content
{
margin-left: 200px;
padding: 1px 16px;
height: auto;
}
#media screen and (max-width: 700px)
{
.sidebar
{
width: 100%;
height: auto;
position: relative;
}
.sidebar a
{
float: left;
}
div.content
{
margin-left: 0;
}
}
#media screen and (max-width: 400px)
{
.sidebar a
{
text-align: center;
float: none;
}
}
.airplane
{
margin: 10px auto;
max-width: 500px;
position: relative;
margin-left: 25px;
}
.cockpit
{
margin-left: 25px;
height: 250px;
position: relative;
overflow:hidden;
text-align: center;
border-bottom: 5px solid #993333;
}
.cockpit:before
{
content: "";
display: block;
position: absolute;
top: 0;
left: 0;
height: 500px;
width: 98%;
border-radius: 50%;
border-right: 5px solid #993333;
border-left: 5px solid #993333;
}
.cockpit h2 {
width: 70%;
margin: 120px auto 35px auto;
}
.fuselage
{
margin-left: 25px;
border-right: 5px solid #993333;
border-left: 5px solid #993333;
}
ol
{
list-style :none;
padding: 0;
margin: 0;
}
.row
{
}
.seats
{
margin-left: 25px;
display: flex;
flex-direction: row;
flex-wrap: nowrap;
justify-content: flex-start;
margin: 0 5px 0 250px;
}
.seat {
display: flex;
flex: 0 0 25.28571428571429%;
padding: 5px;
position: relative;
}
.seat:nth-child(3) {
margin-right: 15.28571428571429%;
}
.seat input[type=checkbox] {
position: absolute;
opacity: 0;
}
.seat input[type=checkbox]:checked + label {
background: yellow;
}
.seat input[type=checkbox]:disabled + label {
background: #dddddd;
text-indent: -9999px;
overflow: hidden;
}
.seat input[type=checkbox]:disabled + label:after {
content: "X";
text-indent: 0;
position: absolute;
top: 4px;
left: 50%;
transform: translate(-50%, 0%);
}
.seat input[type=checkbox]:disabled + label:hover {
box-shadow: none;
cursor: not-allowed;
}
.seat label {
display: block;
position: relative;
width: 70%;
text-align: center;
font-size: 11px;
font-weight: bold;
line-height: 1.5rem;
padding: 4px 0px;
background: green;
border-radius: 5px;
}
.seat label:before {
content: "";
position: absolute;
width: 75%;
height: 75%;
top: 1px;
left: 50%;
transform: translate(-50%, 0%);
background: rgba(255, 255, 255, 0.4);
border-radius: 3px;
}
.seat label:hover {
cursor: pointer;
box-shadow: 0 0 0px 2px #5C6AFF;
}

Answer 1

Could you please try seats class in below;
.seats
{
margin-left: 25px;
display: flex;
flex-direction: row;
flex-wrap: nowrap;
justify-content: flex-end;
margin: 0 5px 0 200px;
}

Answer 2

You can fix your margin-left in the following part of your code:
.seat {
display: flex;
flex: 0 0 25.28571428571429%;
padding: 5px;
margin-left: -50px; // lay seats over plane borders
position: relative;
}
With this customization, you can lay your seats over the plane.
This value is for demonstration purposes only and as an example