単一のベースカラーから色の濃淡を生成する

.bg-medium-slate-blue-50 { background-color: #e4dffd; }
.bg-medium-slate-blue-100 { background-color: #c7bffb; }
.bg-medium-slate-blue-200 { background-color: #aaa0f8; }
.bg-medium-slate-blue-300 { background-color: #8983f5; }
.bg-medium-slate-blue-400 { background-color: #6366f1; }
.bg-medium-slate-blue-500 { background-color: #5657cb; }
.bg-medium-slate-blue-600 { background-color: #4949a6; }
.bg-medium-slate-blue-700 { background-color: #3c3b82; }
.bg-medium-slate-blue-800 { background-color: #2f2d60; }
.bg-medium-slate-blue-900 { background-color: #232041; }
.bg-medium-slate-blue-950 { background-color: #161423; }