A nice new Dashboard where you can customize every aspect of Home Assistant.
HA will scan installed custom cards so those are also shown in this dashboard.
Per section those lines as text and behind it a color selector.
The section have collection of separated blocks for every custom card, HA Section, etc
Below an example section part from a theme. Those can be managed then from the Dashboard.
card-background-color: rgb(255, 255, 255)
ha-card-border-radius: 6px # 10px
ha-card-background: rgba(144,146,146, 0.3)
ha-card-box-shadow: 0px 0px 1px 1px rgba(50,50,50,0.5)
paper-dialog-background-color: var(--card-background-color)
paper-card-background-color: var(--card-background-color)
switch-checked-button-color: rgb(52, 199, 89)
switch-checked-track-color: rgb(52, 199, 89)
switch-unchecked-button-color: rgb(174, 174, 178)
switch-unchecked-track-color: rgb(174, 174, 178)# Toggles
paper-toggle-button-checked-button-color: var(--switch-checked-button-color)
paper-toggle-button-checked-bar-color: var(--switch-checked-track-color)
paper-toggle-button-unchecked-button-color: var(--switch-unchecked-button-color)
paper-toggle-button-unchecked-bar-color: var(--switch-unchecked-track-color)
table-row-background-color: rgb(255, 255, 255)
table-row-alternative-background-color: rgb(242, 242, 247)
data-table-background-color: var(--primary-background-color)
material-background-color: rgb(255, 255, 255)
material-secondary-background-color: rgb(242, 242, 247)
mdc-theme-surface: var(--primary-background-color)