<h1>SELECT 使用 CSS 来设置箭头。</h1>

​

<select class="classic">

  <option>CSS SELECT 箭头</option>

  <option>不使用图片</option>

  <option>选项</option>

</select>

<br><br>

<select class="round">

  <option>CSS SELECT 箭头</option>

  <option>不使用图片</option>

  <option>选项</option>

</select>

<br><br>

<select class="minimal">

  <option>CSS SELECT 箭头</option>

  <option>不使用图片</option>

  <option>选项</option>

</select>

select {

​

  /* styling */

  background-color: white;

  border: thin solid blue;

  border-radius: 4px;

  display: inline-block;

  font: inherit;

  line-height: 1.5em;

  padding: 0.5em 3.5em 0.5em 1em;

​

  /* reset */

​

  margin: 0;      

  -webkit-box-sizing: border-box;

  -moz-box-sizing: border-box;

  box-sizing: border-box;

  -webkit-appearance: none;

  -moz-appearance: none;

}

​

​

/* arrows */

​

select.classic {

  background-image:

    linear-gradient(45deg, transparent 50%, blue 50%),

    linear-gradient(135deg, blue 50%, transparent 50%),

    linear-gradient(to right, skyblue, skyblue);

  background-position:

    calc(100% - 20px) calc(1em + 2px),

    calc(100% - 15px) calc(1em + 2px),

    100% 0;

  background-size:

    5px 5px,

    5px 5px,

    2.5em 2.5em;

  background-repeat: no-repeat;

}

​

select.classic:focus {

  background-image:

    linear-gradient(45deg, white 50%, transparent 50%),

    linear-gradient(135deg, transparent 50%, white 50%),

    linear-gradient(to right, gray, gray);

  background-position:

    calc(100% - 15px) 1em,

    calc(100% - 20px) 1em,

    100% 0;

  background-size:

    5px 5px,

    5px 5px,

    2.5em 2.5em;

  background-repeat: no-repeat;

  border-color: grey;

  outline: 0;

}

​

​

​

​

select.round {

  background-image:

    linear-gradient(45deg, transparent 50%, gray 50%),

    linear-gradient(135deg, gray 50%, transparent 50%),

    radial-gradient(#ddd 70%, transparent 72%);

  background-position:

    calc(100% - 20px) calc(1em + 2px),

    calc(100% - 15px) calc(1em + 2px),

    calc(100% - .5em) .5em;

  background-size:

    5px 5px,

    5px 5px,

    1.5em 1.5em;

  background-repeat: no-repeat;

}

​

select.round:focus {

  background-image:

    linear-gradient(45deg, white 50%, transparent 50%),

    linear-gradient(135deg, transparent 50%, white 50%),

    radial-gradient(gray 70%, transparent 72%);

  background-position:

    calc(100% - 15px) 1em,

    calc(100% - 20px) 1em,

    calc(100% - .5em) .5em;

  background-size:

    5px 5px,

    5px 5px,

    1.5em 1.5em;

  background-repeat: no-repeat;

  border-color: green;

  outline: 0;

}

​

​

​

​

​

select.minimal {

  background-image:

    linear-gradient(45deg, transparent 50%, gray 50%),

    linear-gradient(135deg, gray 50%, transparent 50%),

    linear-gradient(to right, #ccc, #ccc);

  background-position:

    calc(100% - 20px) calc(1em + 2px),

    calc(100% - 15px) calc(1em + 2px),

    calc(100% - 2.5em) 0.5em;

  background-size:

    5px 5px,

    5px 5px,

    1px 1.5em;

  background-repeat: no-repeat;

}

​

select.minimal:focus {

  background-image:

    linear-gradient(45deg, green 50%, transparent 50%),

    linear-gradient(135deg, transparent 50%, green 50%),

    linear-gradient(to right, #ccc, #ccc);

  background-position:

    calc(100% - 15px) 1em,

    calc(100% - 20px) 1em,

    calc(100% - 2.5em) 0.5em;

  background-size:

    5px 5px,

    5px 5px,

    1px 1.5em;

  background-repeat: no-repeat;

  border-color: green;

  outline: 0;

}

​

​

select:-moz-focusring {

  color: transparent;

  text-shadow: 0 0 0 #000;

}

​

body {

  background-color: rgb(0,159,214);

  font: bold 1em/100% "Helvetica Neue", Arial, sans-serif;

  padding: 2em 0;

  text-align: center;

}

h1 {

  color: white;

  line-height: 120%;

  margin: 0 auto 2rem auto;

  max-width: 30rem;

}