<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <form>
      <fieldset>
        <legend>좋아하는 음식을 고르세요:</legend>
        <div class="checkboxWrapper">
          <input
            type="checkbox"
            id="songpyeon"
            name="food"
            value="songpyeon"
            checked
          />
          <label for="songpyeon"> 송편 </label>
        </div>

        <div class="checkboxWrapper">
          <input
            type="checkbox"
            id="friedShrimp"
            name="food"
            value="friedShrimp"
          />
          <label for="friedShrimp">새우튀김</label>
        </div>
      </fieldset>
    </form>
</body>
</html>
.checkboxWrapper {
  position: relative;
}

.checkboxWrapper label {
  display: block;
  padding: 2px 0 2px 24px;
}

.checkboxWrapper input {
  height: 20px;
  width: 20px;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
}

.checkboxWrapper input + label::before {
  content: '';
  height: 20px;
  width: 20px;
  background-color: #d9d9d9;
  border-radius: 1px;
  position: absolute;
  top: 0;
  left: 0;
}

.checkboxWrapper input + label::after {
  content: '';
  border: 2px solid #ffffff;
  border-left: 0;
  border-top: 0;
  height: 10px;
  width: 6px;
  transform: rotate(45deg);
  position: absolute;
  top: 1px;
  left: 6px;
  opacity: 0;
  transition: opacity 0.2s ease-in-out;
}

.checkboxWrapper input:checked + label::before {
  background-color: #2ac1bc;
  transition: 0.2s ease-in-out;
}

.checkboxWrapper input:checked + label::after {
  opacity: 1;
}

.checkboxWrapper input:focus + label::before {
  box-shadow: 0 0 0 3px #2ac1bc;
  outline: 3px solid transparent;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.