Basic checkbox css

input[type=”checkbox”] is for the actual checkbox, excluding its label

.MyFormClass input[type="checkbox"] {
  display: inline-block;
  margin-right: 4px;    /*Gap between checkbox and its label*/
  margin-left: 8px;    /*Gap between checkbox and previous label*/
}

Style a checkbox and its label

Put it within a div

<div class="MyCheckboxStyle"><input type="checkbox" name="MyCheckbox" value="1" />My Checkbox Label</div>

Checkbox + Label on line with space added under

<input type="checkbox" name="CheckboxSetting1" $CheckboxSetting1_Checked value="Yes" /><label>Checkbox Setting 1</label>

input[type="checkbox"] {
  display: inline-block;
}
input[type="checkbox"] + label {
  display: inline-block;
  margin-bottom: 10px;
}

Checkbox as an attractive tick box

CSS

/*-------------------------*/
/*----- TICK CHECKBOX -----*/
/*------------------- -----*/

/* Customize the label (the container) */
.odac_tick_checkbox .container {
  display: block;
  position: relative;
  width: 180px;
  height: 40px;
  margin-bottom: 14px;
  cursor: pointer;
  font-size: 14px;
  line-height: 16px;
  text-align: left;
  padding-top: 0px;
  padding-bottom: 0px;
  padding-left: 37px;
  padding-right: 6px;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  background-color: #EBEBEB;
  border-radius: 4px;
}
.odac_tick_checkbox .container .vert_align_middle {
  position: absolute;
  top: 50%;
  transform: translateY(-54%);
}


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

/* Create a custom checkbox */
.odac_tick_checkbox .checkmark {
  position: absolute;
  top: 7px;
  left: 6px;
  height: 25px;
  width: 25px;
  background-color: #D3D3D3;
}

/* On mouse-over, add a grey background color */
.odac_tick_checkbox .container:hover input ~ .checkmark {
  background-color: #ccc;
}

/* When the checkbox is checked, add a teal background */
.odac_tick_checkbox .container input:checked ~ .checkmark {
  background-color: var(--odac-color-main1);
}


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

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

/* Create the checkmark/indicator symbol (this shape is the tick!)*/
.odac_tick_checkbox .container .checkmark:after {
  left: 9px;
  top: 5px;
  width: 7px;
  height: 14px;
  border: solid white;
  border-width: 0 3px 3px 0;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
}

HTML

  <div class="odac_tick_checkbox">
    <label class="container"><div class="vert_align_middle">My Option</div>
      <input type="checkbox" name="MyOption" value="1" >
      <span class="checkmark"></span>
    </label>
  </div>