CSS configuration

[alsa85]

Hi, I'm a newbee whit vue and I have a little project in which I use bootstrap-vue. I need to integrate Calendar component of Vuetify but I have problem with CSS (I think). I have installed Vuetify and I simply have copied the example of calendar which I found here: https://vuetifyjs.com/en/components/calendars/
but I see without the right colors and without anyelse. I post the image in as you can see. Can anyone help me please?