Issue with Input & Select tag height in form

You have to give height to your select & give box-sizing property for this also.

select {
    border:1px solid #ccc;
    vertical-align:top;
    height:20px;
}
input, select{
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
}

Check this http://jsfiddle.net/RCnQa/16/

Works on IE8 & above.

try using box-sizing:

input, select, option {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;  
}
input, select {
    width:100px;
    height:20px;
    border : 1px #ccc solid;
    vertical-align:top;
}

example fiddle: http://jsfiddle.net/RCnQa/17/