JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
<div class="children" style="margin-left:auto; margin-right:auto;padding:10px 0 0 0;">
    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
        <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
            <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
                <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
                    <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
                        <img class="medium_thumb_rounded" id="15" src="https://www.blackbaud.com/image/products/luminate-online/img_Advocacy.png">
</div>
</div>

CSS

.medium_thumb_rounded {

  display:inline-block;
  border: 1px solid #B6BCBF;
  height: 80px;
  margin-right: 1px;
  margin-bottom: 5px;
  width: 80px;

  -webkit-border-radius: 3px;
  -moz-border-radius: 3px;
       border-radius: 3px;
}
div.children {
    width: 80%;
    text-align: left;
}
div.parent {
    text-align: center;
}