button { width:22px; height:22px; background-color:white; border-width:1px; }
.alpha { color:red; border-color:red; }
.a, .b, .c, .d, .e, .f, .g, .h, .i, .j, .k, .l, .m, .n, .o, .p, .q, .r, .s, .t, .u, .v, .w, .x, .y, .z { color:gray; border-color:gray; }
.A, .B, .C, .D, .E, .F, .G, .H, .I, .J, .K, .L, .M, .N, .O, .P, .Q, .R, .S, .T, .U, .V, .W, .X, .Y, .Z { color:black; border-color:black; }
.letter { color:white; border-color:white; width:72px; height:72px; border-width:2px; }
#number { color:red;   border-color:red;   width:72px; height:72px; border-width:2px; }
.alpha:hover  {              background-color:yellow; }
.alpha:active { color:white; background-color:red;    }