* { transition: all 0.15s ease-in-out; }

a { text-decoration: none; border-bottom: .1em dotted transparent; }
a:hover, a:focus, a:active { text-decoration: none; border-bottom: .1em dotted; }

nav a { text-decoration: initial; border-bottom: initial; }
nav a:hover, nav a:focus, nav a:active { text-decoration: initial; border-bottom: initial; }