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HTML 

              
                <h1>Wrap-around ribbons with Sass</h1>
<hr />
<div class="wrapper">
    <div class="basic">
        <div class="container b1">Left ribbon</div>
        <div class="container b2">Right ribbon</div>
        <div class="container b3">Both ribbons</div>
    </div>
    <div class="implemented ">
        <div class="demo simple">
            <h2>Wrap-Around Ribbons</h2>
            <div class="box">
                <p>Basic Example</p>
            </div>
        </div>
        <div class="demo fancy">
            <h2>Wrap-around Ribbons</h2>
            <div class="box">
                <p>Fancy Example</p>
            </div>
        </div>
    </div>
</div>
<hr />
<p>Created by <a href="http://ricardozea.design/?=codepen" target="_blank" title="Link opens in a new tab">Ricardo Zea</a></p>
!

CSS 

              
                //Put this whole mixin in your .scss file:
@mixin ribbon( $ribbon-color:black, $size-left:1em, $size-right:1em) {
    position: relative;
    &:before,
    &:after {
        content: "";
        position: absolute;
    }
    &:before {
        border-top: $size-left solid $ribbon-color;
        bottom: -$size-left;
        border-left: $size-left solid transparent;
        left: 0;
    }
    &:after {
        border-top: $size-right solid $ribbon-color;
        bottom: -$size-right;
        border-right: $size-right solid transparent;
        right: 0;
    }
}


/*Usage:
.selector { @include ribbon($y, 1em, 0); }

Explanation of mixin values:
A. $y: Is the color, I used a Sass variable but you can use whatever you want: #f00 - red - #ff0000
B. 1em: Is the dimensions of the ribbon(s)
C. "1em, 0": Means you're only doing the ribbon on the left
D. "0, 1em": Means you're only doing the ribbon on the right
E. "1em, 1em": Means you're  doing both ribbons  on left and right
*/

//This is the container to which you're going to apply the ribbon to
.container {
    display: inline;
    margin: 0 2%;
    padding: 40px 20px;
    background: $b;
}

//These are the ribbons themselves:

//Left ribbon
.b1 { @include ribbon($y, 1em, 0); }

//Right ribbon
.b2 { @include ribbon($y, 0, 1em); }

//Both ribbons
.b3 { @include ribbon($y, 1em, 1em); }


/*=========*/

//Demos on the right side with red headers
.demo {
    margin-bottom: 20px;
    &:last-of-type {
        margin: 0;
    }
}

//The red headings use the ribbons, see @include property below
h2 {
    @include ribbon(darken($r, 30%), 15px, 15px);
    width: 300px;
    margin: auto;
    padding: 2%;
    background: $r;
}

//Blue boxes under the header
.box {
    width: 270px;
    margin: auto;
    padding: 4%;
    clear: both;
    background: $g;
    box-shadow: inset 0 3px 0 rgba(black, .2);
    font-weight: bold;
}

//Gradient box, fancier-looking demo
.fancy {
    text-shadow: 0 -1px 0 rgba(black, 1);
    h2 {
        background-image: linear-gradient($r, darken($r, 20%));
        box-shadow: 0 2px 2px 1px rgba(black, .2);
    }
    .box {
        border-radius: 0 0 5px 5px;
        background-image: linear-gradient(darken($b, 25%), darken($b, 30%));
        box-shadow: 0 2px 4px 1px rgba(black, .2);
    }
}

//***********NOT NEEDED FOR DEMO***********
.wrapper {
    display: flex;
    & > div {
        padding: 20px 20px 30px;
        margin: 10px;
        background: rgba(white, .05);
        display: inline-block;
        width: 100%;
        border: rgba(white, .06) 1px solid;
        border-radius: 2px;
        box-shadow: 0 2px 2px rgba(black, .1);
    }
}

.basic {
    display: flex !important;
    align-items: center;
    justify-content: space-around;
    width: auto;
}

.new-window {
    position: relative;
    padding-right: 16px;
    &:after {
        content: '';
        display: block;
        width: 14px;
        height: 12px;
        position: absolute;
        top: 10%;
        right: 0;
        background: url(https://i.stack.imgur.com/3H2PQ.png) no-repeat;
    }
}
!

JS 

              
                /*
Original Article:
http://asgeirhoem.no/ex/css-wraparound-ribbon/

Inspired by this article:
http://www.kendallsdesign.com/blog/sass-mixin-wrap-around-ribbons

*/

//Add a title to the links that open in a new tab/window
$("a[target='_blank']").attr({title:'Opens in a new tab/window'}).addClass('new-window');
!
999px

Console