CODE

HTML:

<div class="about-container" [style.height]="pageHeight">

  <div class="first-content">
    <div>
      <img src="assets/app-icon/launcher-icon-8x.png" alt="icon" width="150px">
    </div>

    <h1 class="wish-1">Happy New Year <span style="font-size: 60px;">2021</span></h1>

    <p style="font-size: 26px; padding: 10px 20px;">
      May this year bring new happiness, new goals, new achievements, and many new inspirations to your life. Wishing
      you a year fully loaded with happiness.
    </p>

    <h1 style="font-size: 45px; margin: 10px;">Sri Amman Silks and Traders</h1>
    <span style="font-size: 35px;">Minnampalli, Salem</span>

    <div>
    <button pButton type="button" (click)="navigate()" label="Continue Shopping" class="p-button-success p-mt-3 p-button-outlined"></button>
  </div>

  <div class="p-m-3 p-p-3"></div>
  </div>

</div>

<div class="snowflakes" aria-hidden="true">
  <div class="snowflake">
    ❅
  </div>
  <div class="snowflake">
    ❅
  </div>
  <div class="snowflake">
    ❆
  </div>
  <div class="snowflake">
    ❄
  </div>
  <div class="snowflake">
    ❅
  </div>
  <div class="snowflake">
    ❆
  </div>
  <div class="snowflake">
    ❄
  </div>
  <div class="snowflake">
    ❅
  </div>
  <div class="snowflake">
    ❆
  </div>
  <div class="snowflake">
    ❄
  </div>
</div>

SCSS:

.about-container {
  width: 100%;
  display: table;
  text-align: center;
  color: white;
  background-image: url("https://explore-share.imgix.net/wp-content/uploads/2018/08/wintry-1938580_960_720.jpg");
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.first-content {
  display: table-cell;
  vertical-align: middle;
  background-color: rgba(0, 0, 0, 0.5);
}

.wish-1 {
  font-family: "Kalam";
  font-weight: bold;
  font-style: italic;
  font-size: 50px;
  animation: colorchange 5s infinite alternate;
}

@keyframes colorchange {
  0% {
    color: blue;
  }

  10% {
    color: #8e44ad;
  }

  20% {
    color: #1abc9c;
  }

  30% {
    color: #d35400;
  }

  40% {
    color: blue;
  }

  50% {
    color: #34495e;
  }

  60% {
    color: blue;
  }

  70% {
    color: #2980b9;
  }
  80% {
    color: #f1c40f;
  }

  90% {
    color: #2980b9;
  }

  100% {
    color: pink;
  }
}

/* customizable snowflake styling */
.snowflake {
  color: #4ec2f4;
  font-size: 1em;
  font-family: Arial;
  text-shadow: 0 0 1px #000;
}

@-webkit-keyframes snowflakes-fall {
  0% {
    top: -10%;
  }
  100% {
    top: 100%;
  }
}
@-webkit-keyframes snowflakes-shake {
  0% {
    -webkit-transform: translateX(0px);
    transform: translateX(0px);
  }
  50% {
    -webkit-transform: translateX(80px);
    transform: translateX(80px);
  }
  100% {
    -webkit-transform: translateX(0px);
    transform: translateX(0px);
  }
}
@keyframes snowflakes-fall {
  0% {
    top: -10%;
  }
  100% {
    top: 100%;
  }
}
@keyframes snowflakes-shake {
  0% {
    transform: translateX(0px);
  }
  50% {
    transform: translateX(80px);
  }
  100% {
    transform: translateX(0px);
  }
}
.snowflake {
  position: fixed;
  top: -10%;
  z-index: 9999;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  cursor: default;
  -webkit-animation-name: snowflakes-fall, snowflakes-shake;
  -webkit-animation-duration: 10s, 3s;
  -webkit-animation-timing-function: linear, ease-in-out;
  -webkit-animation-iteration-count: infinite, infinite;
  -webkit-animation-play-state: running, running;
  animation-name: snowflakes-fall, snowflakes-shake;
  animation-duration: 10s, 3s;
  animation-timing-function: linear, ease-in-out;
  animation-iteration-count: infinite, infinite;
  animation-play-state: running, running;
}
.snowflake:nth-of-type(0) {
  left: 1%;
  -webkit-animation-delay: 0s, 0s;
  animation-delay: 0s, 0s;
}
.snowflake:nth-of-type(1) {
  left: 10%;
  -webkit-animation-delay: 1s, 1s;
  animation-delay: 1s, 1s;
}
.snowflake:nth-of-type(2) {
  left: 20%;
  -webkit-animation-delay: 6s, 0.5s;
  animation-delay: 6s, 0.5s;
}
.snowflake:nth-of-type(3) {
  left: 30%;
  -webkit-animation-delay: 4s, 2s;
  animation-delay: 4s, 2s;
}
.snowflake:nth-of-type(4) {
  left: 40%;
  -webkit-animation-delay: 2s, 2s;
  animation-delay: 2s, 2s;
}
.snowflake:nth-of-type(5) {
  left: 50%;
  -webkit-animation-delay: 8s, 3s;
  animation-delay: 8s, 3s;
}
.snowflake:nth-of-type(6) {
  left: 60%;
  -webkit-animation-delay: 6s, 2s;
  animation-delay: 6s, 2s;
}
.snowflake:nth-of-type(7) {
  left: 70%;
  -webkit-animation-delay: 2.5s, 1s;
  animation-delay: 2.5s, 1s;
}
.snowflake:nth-of-type(8) {
  left: 80%;
  -webkit-animation-delay: 1s, 0s;
  animation-delay: 1s, 0s;
}
.snowflake:nth-of-type(9) {
  left: 90%;
  -webkit-animation-delay: 3s, 1.5s;
  animation-delay: 3s, 1.5s;
}

This page results as: