CSS Column Count - Change order

Question

I want to change the order of the columns here:

#container {
    position: relative;
    width: 600px;
}

#column-wrapper {
    -webkit-column-count: 3;
    -moz-column-count: 3;
    column-count: 3;
    -webkit-column-gap: 20px; 
    -moz-column-gap: 20px;
    column-gap: 20px;
}

#column-wrapper .column {
    display: inline-block;
    width: 100%;
    padding: 20px 0;
    margin-bottom: 20px;
    background-color: green;
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    color: #fff;
}

<div id="container">

    <div id="column-wrapper">
        
        <div class="column">
            <span>1</span>
        </div>
        
        <div class="column">
            <span>2</span>
        </div>
        
        <div class="column">
            <span>3</span>
        </div>
        
        <div class="column">
            <span>4</span>
        </div>
        
         <div class="column">
            <span>5</span>
        </div>
        
         <div class="column">
            <span>6</span>
        </div>
        
    </div>
    
</div>

The result should be this:

Does anyone know a simple solution for this?

Answer 1

Why are you using columns when you want a row based order ? Looks like a job for the flex model. Without changing your HTML you can do this:

#container {
    position: relative;
    width: 600px;
}

#column-wrapper {
    display: flex;
    flex-wrap: wrap
}

#column-wrapper .column {
    display: inline-block;
    width: calc(30% - 20px);
    padding: 20px 0;
    margin: 20px;
    background-color: green;
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    color: #fff;
}

<div id="container">

    <div id="column-wrapper">
        
        <div class="column">
            <span>1</span>
        </div>
        
        <div class="column">
            <span>2</span>
        </div>
        
        <div class="column">
            <span>3</span>
        </div>
        
        <div class="column">
            <span>4</span>
        </div>
        
         <div class="column">
            <span>5</span>
        </div>
        
         <div class="column">
            <span>6</span>
        </div>
        
    </div>
    
</div>