table-sticky-complex-flex-example.css

.example-container {
  height: 400px;
  overflow: auto;
}

.mat-table-sticky {
  background: #59abfd;
  opacity: 1;
}

.example-sticky-toggle-group {
  margin: 8px;
}

.mat-column-filler {
  padding: 0 8px;
  font-size: 10px;
  text-align: center;
}

.mat-header-cell, .mat-footer-cell, .mat-cell {
  min-width: 80px;
  box-sizing: border-box;
}

.mat-header-row, .mat-footer-row, .mat-row {
  min-width: 1920px; /* 24 columns, 80px each */
}

.mat-table-sticky-border-elem-top {
  border-bottom: 2px solid midnightblue;
}

.mat-table-sticky-border-elem-right {
  border-left: 2px solid midnightblue;
}

.mat-table-sticky-border-elem-bottom {
  border-top: 2px solid midnightblue;
}

.mat-table-sticky-border-elem-left {
  border-right: 2px solid midnightblue;
}