create ribbon with css

Question

I have sidebar menu finally created. now I need create ribbon on selected item like show image (red) (I need really gray color ribbon). But I don\'t want use image background an

Answer 1

it's real with CSS3.

maybe like this:) but you need to customize.

html:

* {
  box-sizing: border-box;
}
.container {
  width: 80%;
  max-width: 1000px;
  height: 80px;
  margin: 40px auto;
  position: relative;
}
.one > div {
  height: 50px;
}
.main {
  background: #0fadc0;
  position: relative;
  display: block;
  width: 90%;
  left: 50%;
  top: 0;
  padding: 5px;
  margin-left: -45%;
  z-index: 10;
}
.main > div {
  border: 1px dashed #fff;
  border-color: rgba(255, 255, 255, 0.5);
  height: 40px;
}
.bk {
  background: #1199a9;
  position: absolute;
  width: 8%;
  top: 12px;
}
.bk.l {
  left: 0;
}
.bk.r {
  right: 0;
}
.skew {
  position: absolute;
  background: #0c7582;
  width: 3%;
  top: 6px;
  z-index: 5;
}
.skew.l {
  left: 5%;
  transform: skew(00deg, 20deg);
}
.skew.r {
  right: 5%;
  transform: skew(00deg, -20deg);
}
.bk.l > div {
  left: -30px;
}
.bk.r > div {
  right: -30px;
}
.arrow {
  height: 25px !important;
  position: absolute;
  z-index: 2;
  width: 0;
  height: 0;
}
.arrow.top {
  top: 0px;
  border-top: 0px solid transparent;
  border-bottom: 25px solid transparent;
  border-right: 30px solid #1199a9;
}
.arrow.bottom {
  top: 25px;
  border-top: 25px solid transparent;
  border-bottom: 0px solid transparent;
  border-right: 30px solid #1199a9;
}
.r .bottom {
  border-top: 25px solid transparent;
  border-bottom: 0px solid transparent;
  border-left: 30px solid #1199a9;
  border-right: none;
}
.r .top {
  border-bottom: 25px solid transparent;
  border-top: 0px solid transparent;
  border-left: 30px solid #1199a9;
  border-right: none;
}
@media all and (max-width: 1020px) {
  .skew.l {
    left: 5%;
    transform: skew(00deg, 25deg);
  }
  .skew.r {
    right: 5%;
    transform: skew(00deg, -25deg);
  }
}
@media all and (max-width: 680px) {
  .skew.l {
    left: 5%;
    transform: skew(00deg, 30deg);
  }
  .skew.r {
    right: 5%;
    transform: skew(00deg, -30deg);
  }
}
@media all and (max-width: 460px) {
  .skew.l {
    left: 5%;
    transform: skew(00deg, 40deg);
  }
  .skew.r {
    right: 5%;
    transform: skew(00deg, -40deg);
  }
}

https://jsfiddle.net/5pu4rqr8/

this is a pure copy/paste from @willpaige's CodePen