CODEWITHSUNDEEP
htmlcssimagecss-positioncentering
Matt.Owen
Matt.Owen

Reputation: 391

Image not centered with 50%

I have an image set to left: 50%;. However, it's a little too far to the right, like the selector is not in the center, but on the left side.

My CSS Code:

#scroll-down {
  position: fixed;
  width: 100%;
  height: 64px;
  margin-top: -64px;
}

#scroll-arrow {
  position: absolute;
  background: url("img/down-arrow.png") center no-repeat;
  width: 64px;
  height: 64px;
  left: 50%;
}

My HTML Code:

<div id="scroll-down">
  <div id="scroll-arrow"></div>
</div>

Upvotes: 3

Views: 690

Answers (3)

novalagung
novalagung

Reputation: 11502

To make the image exactly placed on center, you need to put some margin-left with value is minus half of your image width.

Please try this example

#scroll-down {
    position: fixed;
    width: 100%;
    height: 64px;
}

#scroll-arrow {
    position: absolute;
    background: url("http://placehold.it/100x100") center no-repeat;
    width: 64px;
    height: 64px;
    left: 50%;
    margin-left: -32px; /* value -32px comes from (width / 2 * -1) */
}
<div id="scroll-down">
    <div id="scroll-arrow"></div>
</div>

Upvotes: 2

Rahul Desai
Rahul Desai

Reputation: 15501

The image width is 64px so to make it exactly in the center, left value should be 50% - 32px.

Use: calc() - CSS | MDN

calc() browser compatibility

#scroll-down {
  position: fixed;
  width: 100%;
  height: 64px;
  margin-top: -64px;
  border: 1px solid red;
}

#scroll-arrow {
  position: absolute;
  background: url("https://cdn2.hubspot.net/hub/31306/file-25644574-png/images/arrow_down1.png") center no-repeat;
  width: 64px;
  height: 64px;
  left:-webkit-calc(50% - 32px);
  left:-moz-calc(50% - 32px);
  left:calc(50% - 32px);  
  border: 1px solid black;
}
<div id="scroll-down">
  <div id="scroll-arrow"></div>
</div>

Upvotes: 2

kukkuz
kukkuz

Reputation: 42352

Use transform: translate(-50%, 0) to center it horizontally.

(removed margin-top you had for scroll-down too for illustration)

#scroll-down {
  position: fixed;
  width: 100%;
  height: 64px;
}

#scroll-arrow {
  position: absolute;
  background: url("http://placehold.it/100x100") center no-repeat;
  width: 64px;
  height: 64px;
  left: 50%;
  transform: translate(-50%, 0);
}
<div id="scroll-down">
  <div id="scroll-arrow"></div>
</div>

Upvotes: 2

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