100% width input with padding

Question

How to make textarea/input that has left/right padding 10px and will be as wide as its parent.

textarea,input{
    padding:5px 10px 5px 10px; 
    width:100%;
}

In that case input is wider.

Answer 1

    textarea{
        box-sizing: border-box;
        width:100%;
        padding: 10px
    }