body            { font-family:sans-serif;margin:0 }
.pad            { padding:1em }
.pad-3          { padding:3em }
.margin-a       { margin:auto }
.flex           { display:flex }
.col            { display:flex;flex-direction:column }
.align-center   { align-items:center }
.grow           { flex-grow:1 }
.self-center    { align-self:center }
.text-center    { text-align:center }
.justify-center { justify-content:center }