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test
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@@ -1 +1,73 @@
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`z-index`に何も指定しなければ、後に書いた方が上にきます。
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```HTML
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<div id="outer">
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<div id="inner1"></div>
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<div id="inner2"></div>
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<div>
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```
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```CSS
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html, body {
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width: 100%;
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height: 100%;
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}
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div {
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width: 100%;
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height: 100%;
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}
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#outer {
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position: relative;
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background-color: pink;
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}
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#inner1 {
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position: absolute;
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background-color: aqua;
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}
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#inner2 {
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position: absolute;
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background-color: lime;
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top: 100px;
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}
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```
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