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grid-rwd-mobile-first.html
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<!doctype html>
<html lang="is">
<head>
<meta charset="utf-8">
<title>Grid</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
main {
/*
setjum eitt "gutter" vinsta og hægra megin til að efni leggist ekki
upp að viewport í minni upplausn
*/
padding-left: 20px;
padding-right: 20px;
}
/* stillingar fyrir grid */
.grid {
max-width: 1200px;
margin: 0 auto;
}
.row {
display: flex;
flex-wrap: wrap;
margin-left: -10px;
margin-right: -10px;
}
.col {
padding-left: 10px;
padding-right: 10px;
}
.col-12 {
width: 100%;
}
.col-sm-12 {
width: 100%;
}
.col-sm-6 {
width: 50%;
}
.col-sm-3 {
width: 25%;
}
.offset-sm-0 {
margin-left: 0;
}
/* frá og með 600px birtum við "desktop" útlit */
@media (min-width: 600px) {
.col-6 {
width: 50%;
}
.col-3 {
width: 25%;
}
.offset-3 {
margin-left: 25%;
}
}
/* aðrir stílar */
.box {
box-sizing: border-box;
margin-bottom: 30px;
padding: 1rem;
border: 1px solid #000;
}
:root {
--offset: 20px;
--max_width: 1200px;
--columns: 12;
--gutter: 20px;
--color: hsla(204, 80%, 72%, 0.25);
--repeating-width: calc(100% / var(--columns));
--column-width: calc((100% / var(--columns)) - var(--gutter));
--background-width: calc(100% + var(--gutter));
--background-columns: repeating-linear-gradient(
to right,
var(--color),
var(--color) var(--column-width),
transparent var(--column-width),
transparent var(--repeating-width)
);
}
/* Styling */
html {
position: relative;
}
html::before {
position: absolute;
top: 0; right: 0; bottom: 0; left: 0;
margin-right: auto;
margin-left: auto;
width: calc(100% - (2 * var(--offset)));
max-width: var(--max_width);
min-height: 100vh;
content: '';
background-image: var(--background-columns);
background-size: var(--background-width) 100%;
z-index: 1000;
pointer-events: none;
}
</style>
</head>
<body>
<main>
<div class="grid">
<div class="row">
<div class="col col-12">
<div class="box">100% dálkur</div>
</div>
</div>
<div class="row">
<div class="col col-6 col-sm-12">
<div class="box">50% dálkur almennt, 100% í minni upplausn</div>
</div>
<div class="col col-6 col-sm-12">
<div class="box">50% dálkur almennt, 100% í minni upplausn</div>
</div>
</div>
<div class="row">
<div class="col col-3 col-sm-6">
<div class="box">25% dálkur almennt, 50% í minni upplausn</div>
</div>
<div class="col col-3 col-sm-6">
<div class="box">25% dálkur almennt, 50% í minni upplausn</div>
</div>
<div class="col col-3 col-sm-6">
<div class="box">25% dálkur almennt, 50% í minni upplausn</div>
</div>
<div class="col col-3 col-sm-6">
<div class="box">25% dálkur almennt, 50% í minni upplausn</div>
</div>
</div>
<div class="row">
<div class="col col-3 col-sm-6 offset-3">
<div class="box">25% dálkur almennt, 50% í minni upplausn, byrjar frá 25%</div>
</div>
<div class="col col-6 col-sm-12">
<div class="box">50% dálkur almennt, 100% í minni upplausn</div>
</div>
</div>
</div>
</main>
</body>
</html>