形狀 - CSS 挑戰

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透過CSS繪製各種形狀

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如何在 CSS 中繪製正方形、梯形、三角形、異形三角形、扇形、圓形、半圓、固定寬高比、0.5px 線？

  
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Shapes</title>
    <link rel="stylesheet" href="styles.css">
  
  
    <div class="square"></div>

    <div class="trapezoidal"></div>

    <div class="triangle"></div>

    <div class="ano-triangle"></div>

    <div class="sector"></div>

    <div class="circle"></div>

    <div class="half-circle"></div>

    <div class="fixed-width-height-ratio"></div>

    <div class="half-one-px-line">0.5px line</div>
  

.square {
  width: 100px;
  height: 100px;
  border-top: 50px solid red;
  border-bottom: 50px solid blue;
  border-right: 50px solid green;
  border-left: 50px solid orange;
}

.trapezoidal {
  width: 100px;
  height: 100px;
  border: 50px solid transparent;
  border-bottom-color: tomato;
}

.triangle {
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-bottom-color: tomato;
}

.sector {
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-bottom-color: tomato;
  border-radius: 50%;
}

.circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: tomato;
}

.half-circle {
  width: 100px;
  height: 50px;
  background-color: tomato;
  border-top-left-radius: 50px;
  border-top-right-radius: 50px;
}

.fixed-width-height-ratio {
  padding-top: 56.25%;
  background-color: blue;
  width: 100%;
}

.half-one-px-line {
  background-color: aqua;
  border-bottom: 1px solid black;
  transform: scaleY(0.5) scaleX(0.5);
  transform-origin: 0 0;
}

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