Column Names not quite centering

I have the correct columns names appearing, but have a hard time getting them to actually center on each puzzle piece.

Column names out of center
The CSS I created is here.

.column-number {
    width: 12%;
    margin-top: 12px;
    float: left;
    box-sizing: border-box;
    position: relative;
    text-align: center;
    z-index: 10;

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The single line I added to the template is:

    <div class="column-number" *ngFor="let i of columnNames" >{{ i }}</div>

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newbiewebSr. Software EngineerAsked:
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Leonidas DosasCommented:
Try to set at CSS at  .column-number:
margin-left: 20%;

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padding-left: 20%;

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newbiewebSr. Software EngineerAuthor Commented:
Neither worked...

Margin left
Margin left
Padding left
Padding left
newbiewebSr. Software EngineerAuthor Commented:
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