*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0 2rem;
}

label {
  cursor: pointer;
}

.customCheckbox {
  /*We do opacity of 0 instead of display none, for accessibility purpose*/
  opacity: 1;
  position: absolute;
  left: -9999px;
}

.customCheckbox + label {
  display: flex; /*this is to make the before and the label in the same line*/
  align-items: center;
  cursor: pointer;
  font-size: 20px;
}
/*to test*/
/* .customCheckbox:hover + label {
  color: red;
}
.customCheckbox:focus + label {
  color: blue;
} */

/*notice how everything below is defined in em, try changing the font size for the label above and notice how the checkbox scales*/
.customCheckbox + label::before {
  content: "";
  width: 1.1em;
  height: 1.1em;
  /* background-color: red; */
  border-radius: 0.15em;
  border: 0.05em solid #000;
  margin-right: 0.5em;
}

/*Hover state*/
.customCheckbox + label:hover::before {
  background-color: #0067b3;
}

/*focus state*/

.customCheckbox:focus + label::before {
  box-shadow: 0 0 20px 0 black;
}

/*disabled state*/
.customCheckbox:disabled + label {
  color: #aaa;
  cursor: not-allowed;
}
.customCheckbox:disabled + label::before {
  background-color: #ccc;
  border-color: #999;
}

/*Checked state*/
.customCheckbox:checked + label::before {
  content: "\2714";
  background-color: #069;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
}