i.user.add {
  --width: 20px;
  --height: 18px;
  width: 20px;
 height: 18px;
 display: block;
 box-sizing: border-box;
 background:
 linear-gradient(
 to left,
 currentColor 8px,
 transparent 0)
 no-repeat 14px 6px/6px 2px,
 linear-gradient(
 to left,
 currentColor 8px,
 transparent 0)
 no-repeat 16px 4px/2px 6px;
}

i.user.add::after,
i.user.add::before {
 content: '';
 position: absolute;
 display: block;
 box-sizing: border-box;
 border: 2px solid
}

i.user.add::before {
 left: 2px;
 top: 0;
 width: 8px;
 height: 8px;
 border-radius: 30px;
}

i.user.add::after {
 top: 9px;
 width: 12px;
 height: 9px;
 border-bottom: 0;
 border-top-left-radius: 3px;
 border-top-right-radius: 3px;
}

label>i.user.add:first-child {
  left: 9px;
}

i.user.add+input {
  padding-left: 37px;
}