:root {
     --main-bg-primary-color: #808080;
     --main-bg-secondary-color: #999999;
     --main-bg-tertiary-color: #b3b3b3;

     --primary-color: #009eb3;
     --secondary-color: #008799;
     --tertiary-color: #007180;
}

::selection {
     background-color: var(--primary-color);
     color: #fff;
}