.u-section-1 {
  filter: none;
  background-image: linear-gradient(to bottom, rgba(232, 242, 254, 0.3) 0%, rgba(6, 89, 184, 0.3) 100%);
}

.u-section-1 .u-sheet-1 {
  min-height: 411px;
}

.u-section-1 .u-custom-html-1 {
  height: auto;
  min-height: 157px;
  margin: 97px -14px 60px 14px;
}

@media (max-width: 1199px) {
   .u-section-1 {
    background-position: 50% 50%;
    background-repeat: no-repeat;
    background-size: cover;
  }

  .u-section-1 .u-sheet-1 {
    min-height: 390px;
  }

  .u-section-1 .u-custom-html-1 {
    margin-left: 0;
    margin-right: 0;
  }
}

@media (max-width: 991px) {
  .u-section-1 .u-sheet-1 {
    min-height: 303px;
  }

  .u-section-1 .u-custom-html-1 {
    margin-bottom: 49px;
  }
}

@media (max-width: 767px) {
  .u-section-1 .u-sheet-1 {
    min-height: 323px;
  }

  .u-section-1 .u-custom-html-1 {
    margin-bottom: 60px;
  }
}

@media (max-width: 575px) {
  .u-section-1 .u-sheet-1 {
    min-height: 256px;
  }

  .u-section-1 .u-custom-html-1 {
    margin-top: 31px;
    margin-right: initial;
    margin-left: initial;
  }
} .calendar-container {
  position: relative;
  width: 100%;
  padding-bottom: 75%; /* verhouding */
  height: 0;
  overflow: hidden;
  border: solid 1px #777; /* jouw originele rand */
}
.calendar-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
@media (max-width: 768px) {
  .calendar-container {
    padding-bottom: 120%;
  }
}