take care of basic readability / accessibility issues in Riot

style.css

.mx_EventTile_highlight, .mx_EventTile_highlight .markdown-body {
    color: black !important;
}

.mx_LinkPreviewWidget_description {
    color: #444 !important;
}

.mx_BaseAvatar_image {
    border-radius: 8px;
}

.mx_SenderProfile_name {
    color: black !important;
}

.mx_Pill, .mx_UserPill, .mx_UserPill_me {
    background-color: lightgray !important;
    color: #222 !important;
    margin-right: 4px !important;
    display: inline-grid;
    grid-template-columns: max-content max-content;
    align-items: center;
    font-size: 12px;
}

.mx_TextualEvent {
    opacity: 1;
    color: rgb(80,80,80);
}

body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}