回答編集履歴
1
情報の追加。
test
CHANGED
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@@ -51,3 +51,75 @@
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51
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【radial-gradient - CSS | MDN】
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[https://developer.mozilla.org/ja/docs/Web/CSS/radial-gradient](https://developer.mozilla.org/ja/docs/Web/CSS/radial-gradient)
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---
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**追記：**
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64
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改良。
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68
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```CSS
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72
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div {
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74
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75
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margin: 2em;
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padding: 4em;
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background-position: center;
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background-repeat: no-repeat;
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background-image:
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radial-gradient(circle at left top, rgba(255,0,0,0) 1em, red 1em, red 2em, rgba(255,0,0,0) 2em)
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86
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, radial-gradient(circle at right top, rgba(255,0,0,0) 1em, red 1em, red 2em, rgba(255,0,0,0) 2em)
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, radial-gradient(circle at right bottom, rgba(255,0,0,0) 1em, red 1em, red 2em, rgba(255,0,0,0) 2em)
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90
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, radial-gradient(circle at left bottom, rgba(255,0,0,0) 1em, red 1em, red 2em, rgba(255,0,0,0) 2em)
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, linear-gradient(to bottom, red 1em, rgba(255,0,0,0) 1em )
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, linear-gradient(to left, red 1em, rgba(255,0,0,0) 1em )
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, linear-gradient(to top, red 1em, rgba(255,0,0,0) 1em )
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, linear-gradient(to right, red 1em, rgba(255,0,0,0) 1em )
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;
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background-size:
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auto auto
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, auto auto
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, auto auto
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, auto auto
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, calc(100% - 2em) auto
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, auto calc(100% - 2em)
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, calc(100% - 2em) auto
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, auto calc(100% - 2em)
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;
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}
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```**動くサンプル：**[https://jsfiddle.net/pzm6qw70/1/](https://jsfiddle.net/pzm6qw70/1/)
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