AWS Cloudwatch dashboard css improvements

cloudwatch.css

// In Cloudwatch dashboards, the widget we add are taking too much space.
// use sth like stylebot to apply it

.SplitPane-module__splitPane___334V0 {
    display: flex;
    min-height: 0;
}

.react-grid-item {
  height: 300px !important;
  position: relative !important;
  top: 0px !important;
}