how to change the color of checkbox code example

Example 1: how to change checkbox checked color in css

input[type="checkbox"]:checked + label::after {
       content: '';
       position: absolute;
       width: 1.2ex;
       height: 0.4ex;
       background: rgba(0, 0, 0, 0);
       top: 0.9ex;
       left: 0.4ex;
       border: 3px solid blue;
       border-top: none;
       border-right: none;
       -webkit-transform: rotate(-45deg);
       -moz-transform: rotate(-45deg);
       -o-transform: rotate(-45deg);
       -ms-transform: rotate(-45deg);
       transform: rotate(-45deg);
    }

    input[type="checkbox"] {
       line-height: 2.1ex;
    }

    input[type="radio"],
    input[type="checkbox"] {
        position: absolute;
        left: -999em;
    }

    input[type="checkbox"] + label {
        position: relative;
        overflow: hidden;
        cursor: pointer;
    }

    input[type="checkbox"] + label::before {
       content: "";
       display: inline-block;
       vertical-align: -25%;
       height: 2ex;
       width: 2ex;
       background-color: white;
       border: 1px solid rgb(166, 166, 166);
       border-radius: 4px;
       box-shadow: inset 0 2px 5px rgba(0,0,0,0.25);
       margin-right: 0.5em;
    }

Example 2: how to change the color of a checkbox in html

<style>
#button{
  background-color:red
}
</style>

<button id='button' type='checkbox'></button>