这应该可以

input {
  width: 25px;
  height: 25px;
}

对我来说，火狐浏览器、Chrome浏览器、iPhone的火狐浏览器、Chrome浏览器和Safari浏览器至少都是如此。

问题是Firefox不听宽度和高度。把它拆了，你就可以走了。

输入(type =复选框){ 宽度:25 px; 高度:25 px; -moz-appearance:没有; ｝ <label><input type="checkbox"> Test</label>

我认为最简单的解决方案是像一些用户建议的那样重新设置复选框的样式。下面的CSS为我工作，只需要几行CSS，并回答OP问题:

input[type=checkbox] {
    -webkit-appearance: none;
    -moz-appearance: none;
    vertical-align: middle;
    width: 14px; 
    height: 14px;
    font-size: 14px;
    background-color: #eee;
}

input[type=checkbox]:checked:after {
    position: relative;
    bottom: 3px;
    left: 1px;
    color: blue;
    content: "\2713"; /* check mark */
}

正如这篇文章中提到的，缩放属性似乎在Firefox上不起作用，并且转换可能会导致不希望看到的效果。

在Chrome和Firefox上测试，应该适用于所有现代浏览器。只需根据需要更改属性(颜色、大小、底部、左侧等)。希望能有所帮助!

使用这个CSS代码

input[type=checkbox]
{
  /* Double-sized Checkboxes */
  -ms-transform: scale(1.5); /* IE */
  -moz-transform: scale(1.5); /* FF */
  -webkit-transform: scale(1.5); /* Safari and Chrome */
  -o-transform: scale(1.5); /* Opera */
  transform: scale(1.5);
  padding: 10px;
}

预览: http://jsfiddle.net/h4qka9td/

*,*:after,*:before { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; padding: 0; margin: 0; } .switch { margin: 50px auto; position: relative; } .switch label { width: 100%; height: 100%; position: relative; display: block; } .switch input { top: 0; right: 0; bottom: 0; left: 0; opacity: 0; z-index: 100; position: absolute; width: 100%; height: 100%; cursor: pointer; } /* DEMO 3 */ .switch.demo3 { width: 180px; height: 50px; } .switch.demo3 label { display: block; width: 100%; height: 100%; background: #a5a39d; border-radius: 40px; box-shadow: inset 0 3px 8px 1px rgba(0,0,0,0.2), 0 1px 0 rgba(255,255,255,0.5); } .switch.demo3 label:after { content: ""; position: absolute; z-index: -1; top: -8px; right: -8px; bottom: -8px; left: -8px; border-radius: inherit; background: #ababab; background: -moz-linear-gradient(#f2f2f2, #ababab); background: -ms-linear-gradient(#f2f2f2, #ababab); background: -o-linear-gradient(#f2f2f2, #ababab); background: -webkit-gradient(linear, 0 0, 0 100%, from(#f2f2f2), to(#ababab)); background: -webkit-linear-gradient(#f2f2f2, #ababab); background: linear-gradient(#f2f2f2, #ababab); box-shadow: 0 0 10px rgba(0,0,0,0.3), 0 1px 1px rgba(0,0,0,0.25); } .switch.demo3 label:before { content: ""; position: absolute; z-index: -1; top: -18px; right: -18px; bottom: -18px; left: -18px; border-radius: inherit; background: #eee; background: -moz-linear-gradient(#e5e7e6, #eee); background: -ms-linear-gradient(#e5e7e6, #eee); background: -o-linear-gradient(#e5e7e6, #eee); background: -webkit-gradient(linear, 0 0, 0 100%, from(#e5e7e6), to(#eee)); background: -webkit-linear-gradient(#e5e7e6, #eee); background: linear-gradient(#e5e7e6, #eee); box-shadow: 0 1px 0 rgba(255,255,255,0.5); -webkit-filter: blur(1px); -moz-filter: blur(1px); -ms-filter: blur(1px); -o-filter: blur(1px); filter: blur(1px); } .switch.demo3 label i { display: block; height: 100%; width: 60%; border-radius: inherit; background: silver; position: absolute; z-index: 2; right: 40%; top: 0; background: #b2ac9e; background: -moz-linear-gradient(#f7f2f6, #b2ac9e); background: -ms-linear-gradient(#f7f2f6, #b2ac9e); background: -o-linear-gradient(#f7f2f6, #b2ac9e); background: -webkit-gradient(linear, 0 0, 0 100%, from(#f7f2f6), to(#b2ac9e)); background: -webkit-linear-gradient(#f7f2f6, #b2ac9e); background: linear-gradient(#f7f2f6, #b2ac9e); box-shadow: inset 0 1px 0 white, 0 0 8px rgba(0,0,0,0.3), 0 5px 5px rgba(0,0,0,0.2); } .switch.demo3 label i:after { content: ""; position: absolute; left: 15%; top: 25%; width: 70%; height: 50%; background: #d2cbc3; background: -moz-linear-gradient(#cbc7bc, #d2cbc3); background: -ms-linear-gradient(#cbc7bc, #d2cbc3); background: -o-linear-gradient(#cbc7bc, #d2cbc3); background: -webkit-gradient(linear, 0 0, 0 100%, from(#cbc7bc), to(#d2cbc3)); background: -webkit-linear-gradient(#cbc7bc, #d2cbc3); background: linear-gradient(#cbc7bc, #d2cbc3); border-radius: inherit; } .switch.demo3 label i:before { content: "off"; text-transform: uppercase; font-style: normal; font-weight: bold; color: rgba(0,0,0,0.4); text-shadow: 0 1px 0 #bcb8ae, 0 -1px 0 #97958e; font-family: Helvetica, Arial, sans-serif; font-size: 24px; position: absolute; top: 50%; margin-top: -12px; right: -50%; } .switch.demo3 input:checked ~ label { background: #9abb82; } .switch.demo3 input:checked ~ label i { right: -1%; } .switch.demo3 input:checked ~ label i:before { content: "on"; right: 115%; color: #82a06a; text-shadow: 0 1px 0 #afcb9b, 0 -1px 0 #6b8659; } <div class="switch demo3"> <input type="checkbox"> <label><i></i> </label> </div> <div class="switch demo3"> <input type="checkbox" checked> <label><i></i> </label> </div>

你可以在Safari中让复选框变大——这通常是对常规方法的抵抗——使用这个属性:

源