Display a Div Width 100% With Margins

Display a div width 100% with margins

You can use the following CSS to achieve the desired result:

#page {
   background: red;
   overflow: auto;
}

#margin {
   background: green;
   height: 280px;
   margin: 10px
}

div with 100% width including margins

be sure to use box-sizing: border-box when using padding to force the padding to behave like it should. As far as the horizontal padding goes, you can just add padding: 0 3px; to .container

*{ //adds to all elements or you can just add to the ones that use padding
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;    
}

.container{
  border: 1px solid gray;
  padding: 0 3px; <-----add this
}

FIDDLE

Div 100% width and a margin

You don't have to give width when you are using margin-left and margin-right.

Try This:

#main
{
 margin-left: 10%;
 margin-right: 10%;
 background: red;
}

Margin on fixed div with width 100%?

If you change width: 100% for this css:

right:0px;
left: 0px;
margin-left:17px;
margin-right:15px;

it works but i dont think its the best solution.

How to make an element width: 100% minus padding?

box-sizing: border-box is a quick, easy way to fix it:

This will work in all modern browsers, and IE8+.

Here's a demo: http://jsfiddle.net/thirtydot/QkmSk/301/

.content {
    width: 100%;
    box-sizing: border-box;
}

The browser prefixed versions (-webkit-box-sizing, etc.) are not needed in modern browsers.

Margin-right broken on width 100%

An absolutely positioned element is positioned with top, left, right and bottom, not with margin.

Divs not occupying 100% screen width

What is causing the overflow is the grid-gap property in #header and .grid, they are not counted towards the percentage values you've added, you should remove that and use padding to create the desired spacing.

Edit:

 #header {
    width: 100%;
    height: 50px;
    background-color: red;
    display: grid;
    grid-template-columns: 30% 70%;
    /* grid-gap: 10px; remove this */
    position: fixed;
}
.grid {
    width: 100%;
    height: 150px;
    display: grid;
    grid-template-columns: 25% 75%;
    /* grid-gap: 10px; and this */
}

Edit 2:

Alternatively you can also use the fr unit to occupy the remaining space and still use the grid-gap property:

 #header {
    width: 100%;
    height: 50px;
    background-color: red;
    display: grid;
    grid-template-columns: 30% 1fr; /* 1fr will be 70% - 10px */
    grid-gap: 10px;
    position: fixed;
}
.grid {
    width: 100%;
    height: 150px;
    display: grid;
    grid-template-columns: 25% 1fr; /* 1fr will be 75% - 10px */
    grid-gap: 10px;
}

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