:root {
/*  --md-primary-fg-color:        #E6E6E6;*/
  --md-primary-fg-color:        #4F8BC9;
  --md-primary-fg-color--light: #83C1EC	;
  --md-primary-fg-color--dark:  #3762A4;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  width: 100%;
  margin: 0;          /* remove margens extras */
  line-height: 0;     /* evita espaçamento vertical */
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;     /* força bloco e elimina espaço inline */
}