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HTML

              
                 <div class="container">
    <weather-card></weather-card>
  </div>

<div class="created">
  <span>Created by</span>
  <a href="https://manz.dev/"><h2>Manz.dev</h2></a>
  <p>on <a href="https://twitch.tv/ManzDev">Twitch</a> / <a href="https://youtube.com/c/ManzDev">Youtube</a></p>
</div>
              
            
!

CSS

              
                @use postcss-nested;

html {
  height: 100vh;
  background: linear-gradient(#224, #445) fixed;
}

body {
  margin: 0;
}

.container {
  display: flex;
  justify-content: center;
  margin-top: 2em;
}

.created {
  background: 
    url(https://assets.codepen.io/154065/internal/avatars/users/default.png),
    linear-gradient(to bottom, #884ced, #ec1cce);
  background-size: 75px 75px, cover;
  background-repeat: no-repeat;
  position: absolute;
  top: 0;
  right: 0;
  width: 250px;
  height: 75px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-left: 2em;
  
  & span,
  & h2,
  & p,
  & a {
    font-family: Montserrat;
    margin: 0;
  }
  
  & a,
  & p,
  & span {
    color: #fff;    
  }
  
  & h2 {
    font-weight: 700;
    transform: translate(0, -4px);    
  }
  
  & a {
    text-decoration-color: rgba(255,255,255,0.4);
  }
  
  & a:hover {
    color: #e6e82a;
  }
}
              
            
!

JS

              
                class WeatherCard extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
    this.currentManz = 0;
  }

  static get styles() {
    return /* css */`
      :host {
        --width: 450px;
        --height: 650px;
      }

      .container {
        width: var(--width);
        height: var(--height);
        background: #fff;
        box-shadow: 0 0 25px 5px #0008;
        position: relative;
      }

      .zone {
        position: absolute;
        bottom: 0;
        overflow: hidden;
        display: grid;
        grid-template-columns: 0.5fr 1.5fr;
        align-items: flex-end;
        padding: 20px;
        padding-bottom: 0;
      }

      .zone .text {
        position: relative;
      }

      .zone h2 {
        font-family: "Bebas Neue";
        font-size: 32px;
        margin: 0;
        border-bottom: 2px solid red;
        margin-bottom: 15px;
      }

      .zone p {
        font-family: EnterCommand;
        font-size: 30px;
        margin: 0;
        margin-bottom: 0.75em;
        line-height: 70%;
        letter-spacing: -0.5px;
        text-shadow: 0 0 2px #0004;
      }

      .zone img {
        max-width: 160px;
        transform: translateY(15px) rotate(-5deg);
        filter: drop-shadow(0 0 5px #0008);
      }
    `;
  }

  connectedCallback() {
    this.render();
  }

  render() {
    this.shadowRoot.innerHTML = /* html */`
    <style>${WeatherCard.styles}</style>
    <div class="container">
      <weather-city class="day"></weather-city>
      <div class="zone">
        <img src="https://manzdev.github.io/twitch-weather-city/manzdev.png" alt="Manz.dev">
        <div class="text">
          <h2>Manz.dev</h2>
          <p>En cuanto deje de llover, cierro stream. Seguro que no se alarga.</p>
        </div>
      </div>
    </div>`;
  }
}

customElements.define("weather-card", WeatherCard);

const BUILDINGS_NUMBER = 6;
const TIME_TO_CHANGE_STAGE = 10000;
const CLOUDS_NUMBER = 10;

class WeatherCity extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
  }

  static get styles() {
    return /* css */`
      :host {
      }

      .container {
        width: 100%;
        height: 75%;

        display: flex;
        flex-direction: column;
        justify-content: flex-end;

        transition: background 1.5s;
        position: relative;
        overflow: hidden;
      }

      :host(.night) .container {
        background: #0f0c20;
      }

      :host(.day) .container {
        background: #1588b6;
      }

      :host(.night) {
        --window-turnoff-color: #000;
        --window-color: #d3a50f;
        --shine-color: gold;
      }

      :host(.day) {
        --window-turnoff-color: #1c1d1dff;
        --window-color: #d3a50f22;
        --shine-color: transparent;
      }

      .sun,
      .moon {
        width: var(--size);
        height: var(--size);
        border-radius: 50%;
        position: absolute;
        top: 30px;
        transition: transform 4s ease-in-out;
        z-index: 2;
      }

      .sun {
        --size: 80px;

        background: #e0a911;
        box-shadow: 0 0 25px 12px #e7af16;
        left: 30px;
      }

      .moon {
        --size: 50px;

        background: #fff;
        box-shadow: 0 0 10px #fff;
        right: 30px;
        background-image:
          radial-gradient(circle 25px at 25% 25%, #eee 0 25%, transparent 28%),
          radial-gradient(circle 30px at 75% 75%, #eee 0 30%, transparent 32%),
          radial-gradient(circle 15px at 45% 75%, #eaeaea 0 30%, transparent 32%);
      }

      :host(.night) .moon,
      :host(.day) .sun {
        transform: translate(0, 0);
      }

      :host(.day) .moon,
      :host(.night) .sun {
        transform: translate(0, 500px);
      }

      .clouds {
        width: 100%;
        height: 250px;
        position: absolute;
        top: 0;
        z-index: 5;
      }

      .buildings {
        width: 100%;
        height: 75%;

        display: flex;
        align-items: flex-end;

        position: relative;
        z-index: 10;
      }
    `;
  }

  connectedCallback() {
    this.render();
    setInterval(() => this.changeStage(), TIME_TO_CHANGE_STAGE);
  }

  generateBuildings() {
    return "<building-city></building-city>".repeat(BUILDINGS_NUMBER);
  }

  generateClouds() {
    return "<cloud-city></cloud-city>".repeat(CLOUDS_NUMBER);
  }

  changeStage() {
    this.classList.toggle("night");
    this.classList.toggle("day");
  }

  render() {
    this.shadowRoot.innerHTML = /* html */`
    <style>${WeatherCity.styles}</style>
    <div class="container">
      <rain-city></rain-city>
      <div class="sun"></div>
      <div class="moon"></div>
      <div class="clouds">
        ${this.generateClouds()}
      </div>
      <div class="buildings">
        ${this.generateBuildings()}
      </div>
    </div>`;
  }
}

customElements.define("weather-city", WeatherCity);

const WINDOWS_NUMBER = 40;

const COLORS = [
  "#333333",
  "#3a3a3a",
  "#444444",
  "#4a4a4a"
];

class BuildingCity extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
  }

  static get styles() {
    return /* css */`
      :host {
        --building-width: 100%;

        display: grid;
        grid-template-columns: repeat(2, 15px);
        grid-template-rows: repeat(auto-fill, 15px);
        justify-content: center;
        padding-top: 20px;
        gap: 15px;

        width: var(--building-width);
        height: var(--building-height);
        background: var(--building-color, #444);

        box-shadow: 0 0 5px #0006 inset;
      }
    `;
  }

  init() {
    const width = Math.floor(Math.random() * 25) + 50;
    const height = Math.floor(Math.random() * 50) + 50;
    const colorIndex = Math.floor(Math.random() * COLORS.length);
    this.style.setProperty("--building-width", `${width}%`);
    this.style.setProperty("--building-height", `${height}%`);
    this.style.setProperty("--building-color", `${COLORS[colorIndex]}`);
  }

  get height() {
    return parseInt(this.style.getPropertyValue("height"));
  }

  connectedCallback() {
    this.init();
    this.render();
  }

  generateWindows() {
    let windows = "";
    for (let i = 0; i < WINDOWS_NUMBER; i++) {
      windows += /* html */`
      <building-window></building-window>`;
    }
    return windows;
  }

  render() {
    this.shadowRoot.innerHTML = /* html */`
    <style>${BuildingCity.styles}</style>
    ${this.generateWindows()}
    `;
  }
}

customElements.define("building-city", BuildingCity);

class BuildingWindow extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
  }

  static get styles() {
    return /* css */`
      :host {
        background: var(--window-turnoff-color);
        transition:
          background 0.5s,
          box-shadow 1s;
      }

      :host(.on) {
        background: var(--window-color);
        box-shadow: 0 0 10px var(--shine-color);
      }
    `;
  }

  connectedCallback() {
    this.render();

    this.setEvent();
  }

  turnOn() {
    this.classList.add("on");
  }

  turnOff() {
    this.classList.remove("off");
  }

  toggle() {
    this.classList.toggle("on");
    this.setEvent();
  }

  setEvent() {
    const ocurrs = Math.floor(Math.random() * 35);
    if (ocurrs !== 0) return;

    const time = 2000 + Math.floor(Math.random() * 10000);
    setTimeout(() => this.toggle(), time);
  }

  render() {
    this.shadowRoot.innerHTML = /* html */`
    <style>${BuildingWindow.styles}</style>
    `;
  }
}

customElements.define("building-window", BuildingWindow);


const RAIN_DROPS_NUMBER = 1000;
const ANGLE = -65 * (Math.PI / 180);

const rain = new Howl({
  src: ["https://manzdev.github.io/twitch-weather-city/sounds/rain-sound.mp3"],
  loop: true
});

class RainCity extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
    this.rainEnabled = true;
  }

  static get styles() {
    return /* css */`
      :host {
        display: inline-block;
        width: 100%;
        height: 100%;
        position: absolute;
        z-index: 20;
      }

      canvas {
        width: 100%;
        height: 100%;
        transform: scaleX(-1);
        filter: blur(0.25px);
      }
    `;
  }

  connectedCallback() {
    this.render();
    this.canvas = this.shadowRoot.querySelector("canvas");
    this.init();
  }

  init() {
    this.ctx = this.canvas.getContext("2d");
    this.canvas.width = parseInt(window.getComputedStyle(this).width) * 2;
    this.canvas.height = parseInt(window.getComputedStyle(this).height) * 2;
    rain.play();

    this.drops = [];
    for (let i = 0; i < RAIN_DROPS_NUMBER; i++) {
      const speed = Math.floor(Math.random() * 15) + 15;
      this.drops.push({
        x: Math.floor(Math.random() * this.canvas.width),
        y: Math.floor(Math.random() * this.canvas.height),
        size: Math.floor(Math.random() * 15) + 7,
        speed,
        color: `rgba(255, 255, 255, ${speed / 20})`,
      });
    }

    setInterval(() => this.loop(), 50);
  }

  update() {
    this.drops.forEach(drop => {
      drop.x -= drop.speed * Math.cos(ANGLE);
      drop.y -= drop.speed * Math.sin(ANGLE);

      const isXOutside = drop.x < 0;
      const isYOutside = drop.y > this.canvas.height;

      if (isXOutside) {
        drop.x = this.canvas.width;
      }
      if (isYOutside) {
        drop.y = 0;
        drop.x = Math.floor(Math.random() * this.canvas.width);
      }
    });
  }

  loop() {
    this.update();
    this.ctx.lineWidth = 1;
    this.ctx.lineCap = "round";
    this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);

    this.drops.forEach(drop => {
      this.ctx.strokeStyle = !this.rainEnabled ? "transparent" : drop.color;
      this.ctx.beginPath();
      this.ctx.moveTo(drop.x, drop.y);
      const x2 = drop.x + (drop.size * Math.cos(ANGLE));
      const y2 = drop.y + (drop.size * Math.sin(ANGLE));
      this.ctx.lineTo(x2, y2);
      this.ctx.stroke();
    });
  }

  render() {
    this.shadowRoot.innerHTML = /* html */`
    <style>${RainCity.styles}</style>
    <canvas></canvas>
    `;
  }
}

customElements.define("rain-city", RainCity);

class CloudCity extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
    this.x = Math.floor(Math.random() * 600);
    this.setY();
  }

  static get styles() {
    return /* css */`
      :host {
        display: inline-block;
        width: var(--width);
        height: var(--height);
        border-radius: 50px;
        opacity: var(--opacity);
        background: #fff;
        position: absolute;
        top: 0;
        left: 0;
        filter: blur(0.75px);
        transform: translate(var(--x, -200px), var(--y));
      }

      :host::before {
        content: "";
        display: inline-block;
        width: 40%;
        height: 50%;
        background: #fff;
        border-radius: 50px;
        position: absolute;
        transform: translate(50%, -50%);

      }

      :host::after {
        content: "";
        display: inline-block;
        width: 40%;
        height: 70%;
        background: #fff;
        border-radius: 50px;
        transform: translate(10%, -50%);
        position: absolute;
        top: 0;
        right: 25px;
      }
    `;
  }

  setY() {
    this.y = Math.floor(Math.random() * 300);
  }

  move() {
    setInterval(() => {
      const isOutside = this.x > 500;
      this.x += 1;

      if (isOutside) {
        this.x = -200;
        this.setY();
      }

      this.style.setProperty("--x", `${this.x}px`);
    }, 30);
  }

  connectedCallback() {
    this.render();
    this.move();

    const width = Math.floor(Math.random() * 50) + 100;
    this.style.setProperty("--width", `${width}px`);
    const height = Math.floor(Math.random() * 50) + 25;
    this.style.setProperty("--height", `${height}px`);

    this.style.setProperty("--y", `${this.y}px`);

    const opacity = (Math.floor(Math.random() * 5) / 10) + 0.5;
    this.style.setProperty("--opacity", opacity);

    const cloudSpeed = 20 + Math.floor(Math.random() * 20);
    this.style.setProperty("--cloud-speed", `${cloudSpeed}s`);
  }

  render() {
    this.shadowRoot.innerHTML = /* html */`
    <style>${CloudCity.styles}</style>
    <div class="container">
    </div>`;
  }
}

customElements.define("cloud-city", CloudCity);

              
            
!
999px

Console