Center elements at % on the webpage using CSS styling

When creating two bars at 70% and 100%, I also want a small triangular shape to point specifically at the 70% mark.

Here is how I am currently drawing the triangle:

.arrowUp {
  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;

  border-bottom: 10px solid black;
}

The challenge arises when attempting to align the triangle tip with the end of the bar by giving left and right margins as 70% and 30%. Unfortunately, this results in misalignment like shown below:

https://i.sstatic.net/FeCQz.png

If anyone knows how to correctly position the triangle tip to match the end of the black bar, kindly share your expertise. Thank you!

csssass

Answer №1

Apply a left margin with a negative value.

.arrowUp {
  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;

  border-bottom: 10px solid black;
  margin-left: -10px;
}

Answer №2

.bar1{
  width: 500px;
  height: 10px;
  background-color: gray;
}
.bar2{
  position: relative;
  width: 70%;
  height: 10px;
  background-color: red;
}
.arrowUp {
  position: absolute;
  top: 100%;
  right: -10px;

  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;

  border-bottom: 10px solid black;
}
<div class="bar1">
  <div class="bar2">
    <span class="arrowUp"></span>
  </div>
</div>

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