src/assets/styles/bmc/custom/_kvm.scss

#terminal-kvm {
  height: calc(100vh - 300px);
  display: flex;
  &.full-window {
   height: calc(100vh - 80px); 
  }
  div:nth-child(1) {
    background: transparent !important;
    display: block !important;
    overflow: hidden !important;
  }
}