UITextField Border won't work

[AliOmari]

i can't put border to UITextField
.txtField{
left :300px;
top :300px;
width :100px;
height :100px;
border-radius: 5;
-ios-border-style: none;
background-color: #ffffff;
border-width: 10px;
border-color: black;
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075);
}