<p>Please select all that apply to you</p>

<label class="container">One
  <input type="checkbox" value="One">
  <span class="checkmark"></span>
</label>

<label class="container">Two
  <input type="checkbox" value="Two">
  <span class="checkmark"></span>
</label>

<label class="container">Three
  <input type="checkbox" value="Three">
  <span class="checkmark"></span>
</label>

<label class="container">Four
  <input type="checkbox" value="Four">
  <span class="checkmark"></span>
</label>

/* Customize the label (the container) */
.container {
  display: block;
  position: relative;
  padding-left: 35px;
  margin-bottom: 20px;
  cursor: pointer;
  font-size: 20px;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

/* Hide the browser's default checkbox */
.container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

/* Create a custom checkbox */
.checkmark {
  position: absolute;
  top: 0;
  left: 0;
  height: 25px;
  width: 25px;
  background-color: #eee;
  border: 1px solid #e7e7e7;
}

.container:hover input ~ .checkmark, .container input[type='checkbox']:focus ~ .checkmark {
  background-color: #ccc;
}

/* When the checkbox is checked, add a teal background */
.container input:checked ~ .checkmark {
  background-color: #107f80;
}

/* Create the checkmark/indicator (hidden when not checked) */
.checkmark:after {
  content: "";
  position: absolute;
  display: none;
}

/* Show the checkmark when checked */
.container input:checked ~ .checkmark:after {
  display: block;
}

/* Style the checkmark/indicator */
.container .checkmark:after {
  left: 9px;
  top: 4px;
  width: 7px;
  height: 13px;
  border: solid white;
  border-width: 0 3px 3px 0;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
}