Ejemplo de animación de formas CSS

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HTML

CSS

* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

body {
        background-color: #1C1E23;
        display: flex;
        align-items: center;
        justify-content: center;
        height: 100vh;
        overflow: hidden;
    }
    
    .codigo {
        position: absolute;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
        background: #272822;
        color: #F8F8F2;
        font-family: 'Consolas', 'Monaco', monospace;
        font-size: 18px;
        padding: 20px;
        border-radius: 8px;
        white-space: pre-line;
        text-align: left;
        line-height: 1.6;
        max-height: 50%;
        max-width: 90%;
        width: 100%;
        overflow-y: auto;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

.selector       { color: #F92672; }
    .property       { color: #66D9EF; }
    .value-number   { color: #AE81FF; }
    .value-string   { color: #E6DB74; }
    .value-color    { color: #A6E22E; }
    .brace          { color: #F8F8F2; }
    .comment        { color: #75715E; }
    .function       { color: #A6E22E; }

.animation-container {
        position: absolute;
        top: 75%;
        left: 50%;
        transform: translate(-50%, -50%);
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 50%;
        overflow: hidden;
        background: transparent;
    }

.container {           
        position: relative;
        width: 200px;
        height: 200px;
    }

.shape {
        position: absolute;
        width: 50px;
        height: 50px;
        background-color: #FFC000;  
        border-radius: 50%; 
        opacity: 1; 
        animation: shapeAnimation 5s infinite alternate linear;
    }

.shape::before {
            content: '';
            position: absolute;  
            width: 100%; 
            height: 100%;
            background-color: rgba(0, 0, 0, 0); 
            border-radius: 50%;
            transform: translate(-50%, -50%); 
            animation: outlineAnimation 5s infinite alternate linear;

}

@keyframes shapeAnimation {
        0% {
            transform: scale(1)
        }

50% {
            transform: scale(1.1)
            animation-delay: 1s;
        }
        100% {
            transform: scale(0.8)
        }   
    }  
    @keyframes outlineAnimation {
        0%
        {
            transform : rotate(0deg); 
            opacity: 0;

}

50% 
        {
            transform : rotate(-45deg);
            opacity: 1;
        
        }
        100%
        {
            transform : rotate(45deg); 
            opacity: 0;

} 
    }