CSS diagonal div background - html

Question

For a website I'm developing I need to include some diagonal shaped borders to a div. These are the main examples which I need to recreate.
double diagonal top border, triangle shaped
Now been scouting the web on how to achieve this, and my first thought as well would be by using ::before. However I can't get it to work without it being positioned absolute which messes up the entire page.
This is my code I have tried to achieve something like this:
.slider-container{
background-color: $blue;
width: 100%;
overflow: hidden;
position: relative;
.col-md-3{
img{
padding: 40px;
width: 100%;
max-width: 400px;
margin: auto;
}
}
&::before {
background: red;
bottom: 100%;
content: '';
display: block;
height: 100%;
position: absolute;
right: 0;
transform-origin: 100% 100%;
transform: rotate(-15deg);
width: 150%;
}
}
<section id="slider">
<div class="container-fluid">
<div class="row slider-container">
<div class="col-md-3">
<p>imgae 1</p>
</div>
<div class="col-md-3">
<p>imgae 2</p>
</div>
<div class="col-md-3">
<p>imgae 3</p>
</div>
<div class="col-md-3">
<p>imgae 4</p>
</div>
</div>
</div>
</section>
Note: it won't work in here but this is the result I get result

Answer 1

With just css and a bit tweaking based on your divs size you could create something like this:
.myclass {
width: 100px;
height: 100px;
background: linear-gradient(45deg, black 0%, black 26%, transparent 26%), linear-gradient(-45deg, black 0%, black 27%, transparent 27%)
}
.myclass2 {
width: 100px;
height: 100px;
background: linear-gradient(-45deg, blue 0%, blue 27%, transparent 27%), linear-gradient(45deg, blue 0%, blue 26%, red 26%)
}
With transparency:
<div class="myclass">My content here</div>
<br/>
Not as easy with transparent:
<div class="myclass2">My content here</div>
Edit: Just tested this in chrome, you might need special linear-gradients for older/other browsers.

Answer 2

The most simple way to achieve this would probably be to use a background image, though the effect may prove to be inconsistent on smaller devices. For this reason, you may want to consider using a hard-stop gradient.
.grad {
background: lightblue; /* For browsers that don't support gradients */
background: -webkit-linear-gradient(170deg, white 0%, white, 15%, lightblue 15%, lightblue 100%);
background: -o-linear-gradient(170deg, white 0%, white, 15%, lightblue 15%, lightblue 100%);
background: -moz-linear-gradient(170deg, white 0%, white, 15%, lightblue 15%, lightblue 100%);
background: linear-gradient(170deg, white 0%, white, 15%, lightblue 15%, lightblue 100%);
width: 100%;
padding: 20px;
}
<div class="grad">
<h1>Hard-stop gradient</h1>
<p>Using this type of gradient, you can create an angled background without using a background image.</p>
</div>
Using this, you can create a gradient from 0% to 15% that is white on both ends, followed by a gradient from 15% to 100% that's fully black. This completely removes the fading effect, giving you your angled background. It's probably the most efficient way as well since it only requires one line of CSS.

Answer 3

Something like this?
div {
background: yellow;
height: 150px;
overflow: hidden;
position: relative;
width: 300px;
}
div::before {
background: red;
bottom: 100%;
content: '';
display: block;
height: 100%;
position: absolute;
right: 0;
transform-origin: 100% 100%;
transform: rotate(-15deg);
width: 150%;
}
<div></div>

Answer 4

You can use clip-path.
body {
margin: 0;
padding: 0;
color: #ffffff;
}
.wrapper {
min-height: 100vh;
min-width: 100vw;
max-width: 100vw;
width: 100vw;
background-color: red;
}
.bg {
min-height: 100vh;
min-width: 100vw;
background-color: blue;
clip-path: polygon(80% 0, 100% 0, 100% 100%, 50% 100%);
}
<div class="wrapper">
<div class="bg"></div>
</div>

Answer 5

For me, the linear-gradient is not smooth ...
I would suggest either clip-path or svg:
svg {
display: block;
width: 100%;
height: 55px;
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 10" preserveAspectRatio="none">
<polygon points="100 0 100 10 0 10" fill="white" />
</svg>

Answer 6

.arrow-right {
width: 0;
height: 0;
border-top: 60px solid green;
border-bottom: 60px solid transparent;
border-left: 60px solid green;
}