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HTML 

              
                -var daysOfTheWeek = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
-var days = [30, 31, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 1, 2, 3];

.container
  .card
    .frame
      .stars
      .stars2
      .stars3
      .cloud.cloud_top.cloud_slow
      .cloud.cloud_bottom.cloud_fast
      .moon
      .tree.tree_dark-green.tree_middle
      .mountain.mountain_dark.mountain_top
      .tree.tree_dark-green.tree_right     
      .mountain.mountain_light.mountain_right
      .tree.tree_light-green.tree_left
      .mountain.mountain_light.mountain_left
  .calendar
    .header
      h1.header_title November
      p.header_subtitle 2022
    .days-of-week
      - for(i=0;i<7;i++)
        p.day-name= daysOfTheWeek[i]
    .days
      - for(i=0;i<35;i++)
        - if(i==0 || i==1 || i==32 || i==33 || i==34)
          p.day-number.day-number_disabled= days[i]
        - else
          p.day-number= days[i]
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Kaushan+Script&family=Open+Sans:wght@300;400&display=swap");

/* --------------------------- Colors ------------------------- */
// Weather Card
$body: #fffff0;
$card: #dff6ff;
$frame: #0061a8;
$shadow-light: rgba(0, 0, 0, 0.1);
$shadow-dark: rgba(0, 0, 0, 0.4);
$shadow-moon: rgba(245, 237, 194, 0.4);
$moon: #f5edc2;
$cloud: #e3e3e3;
$mountain-light: #ffffff;
$mountain-dark: #9aceff;
$tree-dark-green: #228b22;
$tree-light-green: #33ad39;

// Calender Card
$calendar: #ffffff;
$calendar-title: #0061a8;
$calendar-subtitle: #919191;
$day-number: #f0fbfe;
$day-number-disabled: #c1c1c1;
$day-number-border: #9aceff;

/* ---------------------- Width & Heights --------------------- */
// Weather Card
$card-width: 400px;
$card-height: 400px;
$moon-width: 40px;
$moon-height: 40px;
$tree-border-small: 20px;
$tree-border-large: 30px;

// Stars
$starFieldWidth: 1560;
$starFieldHeight: 1560;
$starStartOffset: 600px;

$starOneScrollDuration: 200s;
$starTwoScrollDuration: 225s;
$starThreeScrollDuration: 275s;
$numStarOneStars: 2000;
$numStarTwoStars: 700;
$numStarThreeStars: 200;

/* --------------------------- Mixins -------------------------- */
@mixin flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

@mixin tree-leaves($color, $border-size) {
  border: $border-size solid transparent;
  border-bottom: $border-size solid $color;
}

@mixin star-template($numStars, $starSize, $scrollSpeed) {
  z-index: 10;
  width: $starSize;
  height: $starSize;
  border-radius: 100%;
  background: transparent;
  box-shadow: create-stars($numStars);
  animation: moveStars $scrollSpeed linear infinite;
  &:after {
    content: " ";
    top: -$starStartOffset;
    width: $starSize;
    height: $starSize;
    border-radius: 100%;
    position: absolute;
    background: transparent;
    box-shadow: create-stars($numStars);
  }
}

@mixin cloud-template() {
  position: absolute;
  z-index: 1;
  width: 40px;
  height: 40px;
  background-color: $cloud;
  border-radius: 100%;
  &::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: -12px;
    width: 30px;
    height: 25px;
    background-color: $cloud;
    border-radius: 100% 0 0 100%;
  }
  &::after {
    content: "";
    position: absolute;
    bottom: 0;
    right: -12px;
    width: 30px;
    height: 25px;
    background-color: $cloud;
    border-radius: 0 100% 100% 0;
  }
}

@mixin cloud-position($initialPosX, $initialPosY) {
  top: $initialPosX;
  left: $initialPosY;
}

@mixin cloud-animate($scrollSpeed, $delay) {
  animation: moveCloud $scrollSpeed linear $delay infinite;
}

/* ------------------------ Functions ------------------------ */
@function create-stars($n) {
  $stars: "#{random($starFieldWidth)}px #{random($starFieldHeight)}px #FFF";

  @for $i from 2 through $n {
    $stars: "#{$stars} , #{random($starFieldWidth)}px #{random($starFieldHeight)}px #FFF";
  }
  @return unquote($stars);
}

/* ------------------------ Reset CSS ----------------------- */
*,
*::after,
*::before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* --------------------------- CSS -------------------------- */
body {
  @include flex-center;
  min-height: 100vh;
  background-color: $body;
}

.container {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 1px 1px 10px $shadow-light;
}

.card {
  @include flex-center;
  height: $card-height;
  width: $card-width;
  background-color: $card;
  background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%239ddff9' fill-opacity='0.4' fill-rule='evenodd'/%3E%3C/svg%3E");
}

.frame {
  position: relative;
  height: $card-height - 100;
  width: $card-width - 100;
  background: linear-gradient(to bottom, darken($frame, 40%) 0%, $frame 100%);
  border-radius: 100%;
  box-shadow: inset 0 0 20px $shadow-dark, 0 0 0 8px $card, 0 0 0 10px $frame;
  overflow: hidden;

  .cloud {
    @include cloud-template();

    &_top {
      @include cloud-position(40px, -40px);
    }

    &_bottom {
      @include cloud-position(80px, -40px);
    }

    &_slow {
      @include cloud-animate(60s, 2s);
    }

    &_fast {
      @include cloud-animate(30s, 0s);
    }
  }

  .moon {
    position: absolute;
    top: 40px;
    right: 80px;
    width: $moon-width;
    height: $moon-height;
    border-radius: 100%;
    background-color: $moon;
    box-shadow: 0 0 10px 4px $shadow-moon;
    background-image: radial-gradient(
        circle at 40% 80%,
        #ddc997 10%,
        transparent 0
      ),
      radial-gradient(circle at 55% 70%, #ddc997 5%, transparent 0),
      radial-gradient(circle at 58% 85%, #ddc997 6%, transparent 0),
      radial-gradient(circle at 80% 40%, #ddc997 12%, transparent 0),
      radial-gradient(circle at 87% 58%, #ddc997 4%, transparent 0);
  }

  .mountain {
    position: absolute;
    height: $card-height - 200;
    width: $card-width - 100;
    border-radius: 100%;
    box-shadow: 0 0 20px $shadow-dark;

    &_light {
      background-color: $mountain-light;
    }

    &_dark {
      background-color: $mountain-dark;
    }

    &_left {
      bottom: -150px;
      left: -40px;
    }

    &_right {
      bottom: -120px;
      right: -80px;
    }

    &_top {
      bottom: -110px;
      left: 0;
    }
  }

  .tree {
    position: absolute;
    &::before,
    &::after {
      content: "";
      position: absolute;
    }

    &_dark-green {
      @include tree-leaves($tree-dark-green, $tree-border-small);
      &::before,
      &::after {
        @include tree-leaves($tree-dark-green, $tree-border-small);
      }
    }

    &_light-green {
      @include tree-leaves($tree-light-green, $tree-border-large);
      &::before,
      &::after {
        @include tree-leaves($tree-light-green, $tree-border-large);
      }
    }

    &_middle {
      top: 145px;
      left: 100px;
      &::before {
        top: -5px;
        right: -20px;
      }
      &::after {
        top: 10px;
        right: -20px;
      }
    }

    &_left {
      top: 160px;
      left: 30px;
      &::before {
        top: -10px;
        right: -30px;
      }
      &::after {
        top: 10px;
        right: -30px;
      }
    }

    &_right {
      top: 155px;
      right: 30px;
      &::before {
        top: -5px;
        right: -20px;
      }
      &::after {
        top: 10px;
        right: -20px;
      }
    }
  }
}

.stars {
  @include star-template($numStarOneStars, 1px, $starOneScrollDuration);
}

.stars2 {
  @include star-template($numStarTwoStars, 2px, $starTwoScrollDuration);
}

.stars3 {
  @include star-template($numStarThreeStars, 3px, $starThreeScrollDuration);
}

.calendar {
  padding: 10px;
  position: relative;
  height: $card-height - 60;
  width: $card-width;
  background-color: $calendar;
  font-family: "Open Sans", sans-serif;

  .header {
    padding-top: 5px;
    @include flex-center;
    flex-direction: column;

    &_title {
      font-family: "Kaushan Script", cursive;
      font-size: 28px;
      letter-spacing: 2px;
      line-height: 1;
      color: $calendar-title;
    }

    &_subtitle {
      font-size: 14px;
      color: $calendar-subtitle;
    }
  }

  .days-of-week {
    padding: 10px;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-column-gap: 18px;

    .day-name {
      color: $calendar-title;
    }
  }

  .days {
    padding: 10px;
    display: grid;
    grid-template-columns: repeat(7, 35px);
    grid-column-gap: 18px;
    grid-row-gap: 5px;

    .day-number {
      @include flex-center;
      min-height: 35px;
      border-radius: 100%;
      background-color: $day-number;
      transition: all 0.4s ease-in-out;

      &:hover {
        border: 2px solid $day-number-border;
        transform: scale(1.2);
        background-color: transparent;
      }

      &_disabled {
        pointer-events: none;
        color: $day-number-disabled;
        background: repeating-linear-gradient(
          45deg,
          $day-number,
          $day-number 5px,
          #ffffff 5px,
          #ffffff 10px
        );
      }
    }
  }
}

/* ----------------------- Animations ----------------------- */
@keyframes moveStars {
  from {
    transform: translateY(0px);
  }
  to {
    transform: translateY(-#{$starFieldHeight}px)
      translateX(-#{$starFieldWidth}px);
  }
}

@keyframes moveCloud {
  from {
    transform: translateX(-100px);
  }
  to {
    transform: translateX(350px);
  }
}
!

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