Html 创建特定的CSS网格布局

I have been tasked to recreate this grid layout:

它还说我必须像这样计算列宽:(100/12)*n，其中100是网格容器宽度，12是最大列数，n是列数，例如在第二行有2列，因此在这种情况下n将是2.

我想我做错了.

我是这样做的:

超文本标记语言

<div class="grid-container">
        <div class="row-1 row">
            <div class="column-12">12 kollonas</div>
        </div>

        <div class="row-2 row">
            <div class="column-6">6 kollonas</div>
            <div class="column-6">6 kollonas</div>
        </div>
        
        <div class="row-3 row">
            <div class="column-4">4 kollonas</div>
            <div class="column-4">4 kollonas</div>
            <div class="column-4">4 kollonas</div>
        </div>

        <div class="row-4 row">
            <div class="column-3">3 kollonas</div>
            <div class="column-3">3 kollonas</div>
            <div class="column-3">3 kollonas</div>
            <div class="column-3">3 kollonas</div>
        </div>

        <div class="row-5 row">
            <div class="column-2">2 kollonas</div>
            <div class="column-2">2 kollonas</div>
            <div class="column-2">2 kollonas</div>
            <div class="column-2">2 kollonas</div>
            <div class="column-2">2 kollonas</div>
            <div class="column-2">2 kollonas</div>
        </div>

        <div class="row-6 row">
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
            <div class="column-1">1</div>
        </div>
    </div>

CSS

[class*='column-']{ 
    width: 100%; 
    float: left; 
    min-height: 1px; 
    padding: 15px 0;
    box-sizing: border-box;
}
body{
    background-color: rgb(255, 219, 245);
    font-family: Arial, Helvetica, sans-serif;
}

.grid-container{
    display: grid;
    grid-gap: 4px;
    text-align: center;
    width: 90%;
    margin: auto;
    row-gap: 20px;
}

.column-12{
    grid-column-start: 1;
    grid-column-end: 12;
}

.row{
    display: grid;
    grid-column-start: 1;
    grid-column-end: 12;
    grid-gap: 20px;
}

.row div{
    background-color: white;
    height: 50px;
    border-radius: 5px;
    box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.205);
    color: rgb(158, 58, 167)
}

.row-2{
    grid-template-columns: repeat(2, 1fr);
}

.row-3{
    grid-template-columns: repeat(3, 1fr);
}

.row-4{
    grid-template-columns: repeat(4, 1fr);
}

.row-5{
    grid-template-columns: repeat(6, 1fr);
}

.row-6{
    grid-template-columns: repeat(12, 1fr);
}

The result:

但我觉得我做错了.我觉得有更好的办法.也许有人能帮我？