I need to create a checkbox with an image in it, instead of regular checkmark. It should look like this, [ticked]: 
Here is the code of the element:
.modal-options label {
  color: #f62b3e;
  font-family: sharp-20-regular;
  font-size: 17px;
  text-align: center;
  user-select: none;
  cursor: pointer;
  position: relative;
  padding-left: 5%;
  margin-bottom: 12px;
}
.modal-options input {
  width: 100%;
  cursor: pointer;
  height: 40px;
  width: 40px;
  background-color: transparent;
  border: 1px solid #f62b3e;
}
.modal-options input:checked {
  background-position: right center;
}
.checkmark {
  background-image: url(assets/images/checkbox-smile.svg);
  background-position: left center;
  background-size: auto 100%;
  background-repeat: no-repeat;
  height: 25px;
  width: 25px;
}      
  <label>
       <input type="checkbox" />
       <span class="checkmark"></span>
       <br />
       Just curious
</label>

 
    