These CSS tweaks are for higher density display for Uptime Kuma status pages in dark mode.

Uptime-Kuma-Status-Page-Dark-Mode-High-Density-Tweaks.css

:root {
  --min-item-width: 28ch;
  --max-item-width: .5fr;
  --grid-spacing: .25rem;
  --item-padding: .25rem;
}

/* Let items expand on small screens */
@media (max-width: 600px) {
  :root {
    --max-item-width: 1fr;
  }
}

/* Cap item width for better appearance on large screens */
@media (min-width: 2560px) {
  :root {
    --max-item-width: 300px;
  }
}

/* Readability on 4K screens at distance */
@media (min-width: 3840px) {
  .item-name {
    font-size 1.3em;
    font-weight: 700;
    letter-spacing: 0.8px;
  }
  .badge {
    font-size: .9em;
  }
  .wrap > .d-flex {
    font-size: .9em;
    font-weight: 500;
    letter-spacing: .8px;
  }
}

/* Expand container */
.container {
  max-width: 98%
}

/* Grid layout */
.monitor-list > .monitor-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(var(--min-item-width), var(--max-item-width)));
  grid-gap: var(--grid-spacing);
}

.item {
  width: 100%;
  padding: var(--item-padding) !important;
  border: #3d3d3d solid 2px;
}

.item > .row {
  flex-direction: column;
}

.row > div {
  width: 100%;
}

/* Text readability */
.item-name {
  color: #f1f1f1;
}

/* Badge movement */
.row {
  position: relative;
}
body:not(.mobile) .badge {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

/* Header compacting */
.main {
  position: relative;
}
.overall-status {
  padding: .5rem !important;
}
body:not(.mobile) .overall-status {
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
}

/* Tweaks for mobile size */
body.mobile {}

/* Footer compacting */
footer .alert-heading {
  padding: 0 !important;
}

/* Margin resets */
.mb-4, .mb-5 {
  margin-bottom: .5rem !important;
}

.mt-4 {
  margin-top: .5rem !important;
}
  
.mt-5 {
  margin-top: 0 !important;
}


/* Reduce glaring blue maintenance color */
.bg-maintenance {
  background-color: #4962bd !important;
}

Added tweaks for 4k screen readability