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Create Tetris Heart Animation using HTML & CSS

Below is the html code for this video.

index.html


<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Happy Valentine's Week</title>
    <link rel="stylesheet" href="style.css" />
</head>

<body>
    <h1>Happy Valentine's Week</h1>
    <h3>"The best thing to hold onto in life is each other."</h3>
    <div class="whole-heart">
        <div class="piece-of-heart"></div>
    </div>
</body>

</html>

Below is the css code for this video.

style.css


body {
    background-color: #ee8c68;
    background-image: linear-gradient(45deg, #EE8C68, #EB6B9D);
    overflow: hidden;
    width: 100%;
    height: 100vh;
    font-family: cursive;
}

h1 {
    color: #8B0000;
    position: absolute;
    bottom: 10%;
    width: 100%;
    text-align: center;
    letter-spacing: 1px;
}

h3 {
    color: #660000;
    position: absolute;
    top: 10%;
    transform: translateY(-10%);
    width: 100%;
    text-align: center;
    font-size: 1.5em;
    letter-spacing: 2px;
}

.whole-heart {
    position: absolute;
    left: 50%;
    top: 50%;
    box-shadow: 0px 0 0 7px #FF160C, 18px 0 0 7px #FF160C, 36px 0 0 7px #FF160C, 108px 0 0 7px #FF160C, -18px 18px 0 7px #FF160C,
        0px 18px 0 7px #FF160C, 18px 18px 0 7px #FF160C, 36px 18px 0 7px #FF160C, 54px 18px 0 7px #FF160C, 90px 18px 0 7px #FF160C,
        108px 18px 0 7px #FF160C, 126px 18px 0 7px #FF160C, 162px 18px 0 7px #FF160C, -18px 36px 0 7px #FF160C, 0px 36px 0 7px #FF160C,
        18px 36px 0 7px #FF160C, 36px 36px 0 7px #FF160C, 54px 36px 0 7px #FF160C, 72px 36px 0 7px #FF160C, 90px 36px 0 7px #FF160C,
        108px 36px 0 7px #FF160C, 126px 36px 0 7px #FF160C, 162px 36px 0 7px #FF160C, -18px 54px 0 7px #FF160C, 0px 54px 0 7px #FF160C,
        18px 54px 0 7px #FF160C, 36px 54px 0 7px #FF160C, 54px 54px 0 7px #FF160C, 72px 54px 0 7px #FF160C, 90px 54px 0 7px #FF160C,
        108px 54px 0 7px #FF160C, 126px 54px 0 7px #FF160C, 144px 54px 0 7px #FF160C, 162px 54px 0 7px #FF160C, 0px 72px 0 7px #FF160C,
        18px 72px 0 7px #FF160C, 36px 72px 0 7px #FF160C, 54px 72px 0 7px #FF160C, 72px 72px 0 7px #FF160C, 90px 72px 0 7px #FF160C,
        108px 72px 0 7px #FF160C, 126px 72px 0 7px #FF160C, 144px 72px 0 7px #FF160C, 18px 90px 0 7px #FF160C, 36px 90px 0 7px #FF160C,
        54px 90px 0 7px #FF160C, 72px 90px 0 7px #FF160C, 90px 90px 0 7px #FF160C, 108px 90px 0 7px #FF160C, 126px 90px 0 7px #FF160C,
        36px 108px 0 7px #FF160C, 54px 108px 0 7px #FF160C, 72px 108px 0 7px #FF160C, 90px 108px 0 7px #FF160C, 108px 108px 0 7px #FF160C,
        54px 126px 0 7px #FF160C, 72px 126px 0 7px #FF160C, 90px 126px 0 7px #FF160C, 72px 144px 0 7px #FF160C;
    margin-left: -71px;
    margin-top: -50px;
    animation: incompleteHeart 10s linear;
}

.whole-heart .piece-of-heart {
    position: absolute;
    left: 50%;
    top: 50%;
    box-shadow: 126px 0px 0 7px #FF160C, 144px 0px 0 7px #FF160C, 144px 18px 0 7px #FF160C, 144px 36px 0 7px #FF160C;
    animation: completeHeart 9s linear;
}

@keyframes incompleteHeart {
    0%, 90% {
        box-shadow: 0px 0 0 7px #DDD, 18px 0 0 7px #DDD, 36px 0 0 7px #DDD, 108px 0 0 7px #DDD, -18px 18px 0 7px #DDD, 0px 18px 0 7px #DDD,
            18px 18px 0 7px #DDD, 36px 18px 0 7px #DDD, 54px 18px 0 7px #DDD, 90px 18px 0 7px #DDD, 108px 18px 0 7px #DDD, 126px 18px 0 7px #DDD,
            162px 18px 0 7px #DDD, -18px 36px 0 7px #DDD, 0px 36px 0 7px #DDD, 18px 36px 0 7px #DDD, 36px 36px 0 7px #DDD, 54px 36px 0 7px #DDD,
            72px 36px 0 7px #DDD, 90px 36px 0 7px #DDD, 108px 36px 0 7px #DDD, 126px 36px 0 7px #DDD, 162px 36px 0 7px #DDD, -18px 54px 0 7px #DDD,
            0px 54px 0 7px #DDD, 18px 54px 0 7px #DDD, 36px 54px 0 7px #DDD, 54px 54px 0 7px #DDD, 72px 54px 0 7px #DDD, 90px 54px 0 7px #DDD,
            108px 54px 0 7px #DDD, 126px 54px 0 7px #DDD, 144px 54px 0 7px #DDD, 162px 54px 0 7px #DDD, 0px 72px 0 7px #DDD, 18px 72px 0 7px #DDD,
            36px 72px 0 7px #DDD, 54px 72px 0 7px #DDD, 72px 72px 0 7px #DDD, 90px 72px 0 7px #DDD, 108px 72px 0 7px #DDD, 126px 72px 0 7px #DDD,
            144px 72px 0 7px #DDD, 18px 90px 0 7px #DDD, 36px 90px 0 7px #DDD, 54px 90px 0 7px #DDD, 72px 90px 0 7px #DDD, 90px 90px 0 7px #DDD,
            108px 90px 0 7px #DDD, 126px 90px 0 7px #DDD, 36px 108px 0 7px #DDD, 54px 108px 0 7px #DDD, 72px 108px 0 7px #DDD, 90px 108px 0 7px #DDD,
            108px 108px 0 7px #DDD, 54px 126px 0 7px #DDD, 72px 126px 0 7px #DDD, 90px 126px 0 7px #DDD, 72px 144px 0 7px #DDD;
    }
}

@keyframes completeHeart {
    0%, 24% {
        box-shadow: 126px -72px 0 7px #FF160C, 144px -72px 0 7px #FF160C, 144px -54px 0 7px #FF160C, 144px -36px 0 7px #FF160C;
    }

    25%, 49% {
        box-shadow: 126px -54px 0 7px #FF160C, 144px -54px 0 7px #FF160C, 144px -36px 0 7px #FF160C, 144px -18px 0 7px #FF160C;
    }

    50%, 74% {
        box-shadow: 126px -36px 0 7px #FF160C, 144px -36px 0 7px #FF160C, 144px -18px 0 7px #FF160C, 144px 0px 0 7px #FF160C;
    }

    75%, 99% {
        box-shadow: 126px -18px 0 7px #FF160C, 144px -18px 0 7px #FF160C, 144px 0px 0 7px #FF160C, 144px 18px 0 7px #FF160C;
    }

    100% {
        box-shadow: 126px 0px 0 7px #FF160C, 144px 0px 0 7px #FF160C, 144px 18px 0 7px #FF160C, 144px 36px 0 7px #FF160C;
    }
}

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