HTML Login Form Template

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<body>
    <div class="container">
        <div class="jelly-form">
            <div class="form-header">
                <h2>Welcome</h2>
            </div>
            <form>
                <div class="input-group">
                    <input type="text" required>
                    <label>Username</label>
                    <div class="input-highlight"></div>
                </div>
                <div class="input-group">
                    <input type="password" required>
                    <label>Password</label>
                    <div class="input-highlight"></div>
                </div>
                <button type="submit">
                    <span>Sign In</span>
                    <div class="btn-highlight"></div>
                </button>
            </form>
        </div>

<div class="floating-blob blob-1"></div>
        <div class="floating-blob blob-2"></div>
    </div>

</html>

CSS

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;700&display=swap');

:root {
    --bg-color: #e0e5ec;
    --jelly-color: #e0e5ec;
    --shadow-light: #ffffff;
    --shadow-dark: #a3b1c6;
    --accent: #ff00cc;
    /* Keeping a hint of the user's previous preference or just a nice pop */
    --text-color: #4a4a4a;
}

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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--bg-color);
    font-family: 'Nunito', sans-serif;
    overflow: hidden;
    perspective: 1000px;
}

.container {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.jelly-form {
    position: relative;
    width: 350px;
    padding: 40px;
    border-radius: 50px;
    /* Soft, organic shape */
    background: var(--jelly-color);
    box-shadow:
        20px 20px 60px var(--shadow-dark),
        -20px -20px 60px var(--shadow-light),
        inset 0 0 0 transparent,
        inset 0 0 0 transparent;
    z-index: 10;
    transition: all 0.3s ease;
    animation: morph-form 10s ease-in-out infinite;
    backdrop-filter: blur(5px);
    /* Subtle glass feel */
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.form-header h2 {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 30px;
    font-weight: 700;
    letter-spacing: 1px;
    opacity: 0.8;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group input {
    width: 100%;
    padding: 15px 20px;
    border: none;
    outline: none;
    background: transparent;
    border-radius: 25px;
    color: var(--text-color);
    font-size: 16px;
    box-shadow:
        inset 5px 5px 10px var(--shadow-dark),
        inset -5px -5px 10px var(--shadow-light);
    transition: all 0.3s ease;
}

.input-group label {
    position: absolute;
    left: 20px;
    top: 15px;
    color: #999;
    pointer-events: none;
    transition: 0.3s ease;
    font-size: 16px;
}

.input-group input:focus~label,
.input-group input:valid~label {
    transform: translateY(-35px) translateX(-10px) scale(0.9);
    color: var(--text-color);
    font-weight: bold;
}

.input-group input:focus {
    box-shadow:
        inset 2px 2px 5px var(--shadow-dark),
        inset -2px -2px 5px var(--shadow-light);
}

button {
    width: 100%;
    padding: 15px;
    border: none;
    outline: none;
    border-radius: 25px;
    background: var(--jelly-color);
    color: var(--text-color);
    font-weight: bold;
    font-size: 18px;
    cursor: pointer;
    box-shadow:
        8px 8px 16px var(--shadow-dark),
        -8px -8px 16px var(--shadow-light);
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

button:active {
    box-shadow:
        inset 5px 5px 10px var(--shadow-dark),
        inset -5px -5px 10px var(--shadow-light);
    transform: scale(0.98);
}

/* Floating Blobs */
.floating-blob {
    position: absolute;
    border-radius: 50%;
    background: var(--jelly-color);
    box-shadow:
        10px 10px 30px var(--shadow-dark),
        -10px -10px 30px var(--shadow-light);
    z-index: 1;
    opacity: 0.6;
}

.blob-1 {
    width: 100px;
    height: 100px;
    top: 20%;
    left: 20%;
    animation: float 8s ease-in-out infinite, morph-blob 12s linear infinite;
}

.blob-2 {
    width: 150px;
    height: 150px;
    bottom: 20%;
    right: 20%;
    animation: float 10s ease-in-out infinite reverse, morph-blob 15s linear infinite reverse;
}

/* Animations */
@keyframes morph-form {

0%,
    100% {
        border-radius: 50px 50px 50px 50px / 50px 50px 50px 50px;
    }

33% {
        border-radius: 60px 40px 50px 50px / 50px 60px 40px 50px;
    }

66% {
        border-radius: 40px 60px 50px 50px / 60px 40px 50px 50px;
    }
}

@keyframes morph-blob {

0%,
    100% {
        border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%;
    }

50% {
        border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%;
    }
}

@keyframes float {

0%,
    100% {
        transform: translateY(0);
    }

50% {
        transform: translateY(-20px);
    }
}

/* Dynamic Light Source Classes (applied via JS) */
.jelly-form.light-left {
    box-shadow:
        25px 20px 60px var(--shadow-dark),
        -15px -20px 60px var(--shadow-light);
}

.jelly-form.light-right {
    box-shadow:
        15px 20px 60px var(--shadow-dark),
        -25px -20px 60px var(--shadow-light);
}

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