#b3b3b3 color bugged safari

HTML

Disabled Bugged Gray
<input class="transp bug-color" value="test text" disabled>
<br/>
Disabled Red color
<input class="transp red-color" value="test text" disabled>
<br/>
Enabled Bugged Gray
<input class="transp bug-color" value="test text">

CSS

.transp {
  background-color: transparent;
}
.bug-color {
  color: #b3b3b3;
}
.red-color {
  color: red;
}