CodePen Embed - Glassmorphism Login

<body>
    <section class="container">
        <div class="login-container">
            <div class="circle circle-one"></div>
            <div class="form-container">
                <img src="https://raw.githubusercontent.com/hicodersofficial/glassmorphism-login-form/master/assets/illustration.png" alt="illustration" class="illustration" />
                <h1 class="opacity">LOGIN</h1>
                <form>
                    <input type="text" placeholder="USERNAME" />
                    <input type="password" placeholder="PASSWORD" />
                    <button class="opacity">SUBMIT</button>
                </form>
                <div class="register-forget opacity">
                    <a href="">REGISTER</a>
                    <a href="">FORGOT PASSWORD</a>
                </div>
            </div>
            <div class="circle circle-two"></div>
        </div>
        <div class="theme-btn-container"></div>
    </section>
</body>

:root {
    --background: #1a1a2e;
    --color: #ffffff;
    --primary-color: #0f3460;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    box-sizing: border-box;
    font-family: "poppins";
    background: var(--background);
    color: var(--color);
    letter-spacing: 1px;
    transition: background 0.2s ease;
    -webkit-transition: background 0.2s ease;
    -moz-transition: background 0.2s ease;
    -ms-transition: background 0.2s ease;
    -o-transition: background 0.2s ease;
}

a {
    text-decoration: none;
    color: var(--color);
}

h1 {
    font-size: 2.5rem;
}

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

.login-container {
    position: relative;
    width: 22.2rem;
}
.form-container {
    border: 1px solid hsla(0, 0%, 65%, 0.158);
    box-shadow: 0 0 36px 1px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    backdrop-filter: blur(20px);
    z-index: 99;
    padding: 2rem;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    -ms-border-radius: 10px;
    -o-border-radius: 10px;
}

.login-container form input {
    display: block;
    padding: 14.5px;
    width: 100%;
    margin: 2rem 0;
    color: var(--color);
    outline: none;
    background-color: #9191911f;
    border: none;
    border-radius: 5px;
    font-weight: 500;
    letter-spacing: 0.8px;
    font-size: 15px;
    backdrop-filter: blur(15px);
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
}

.login-container form input:focus {
    box-shadow: 0 0 16px 1px rgba(0, 0, 0, 0.2);
    animation: wobble 0.3s ease-in;
    -webkit-animation: wobble 0.3s ease-in;
}

.login-container form button {
    background-color: var(--primary-color);
    color: var(--color);
    display: block;
    padding: 13px;
    border-radius: 5px;
    outline: none;
    font-size: 18px;
    letter-spacing: 1.5px;
    font-weight: bold;
    width: 100%;
    cursor: pointer;
    margin-bottom: 2rem;
    transition: all 0.1s ease-in-out;
    border: none;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
    -webkit-transition: all 0.1s ease-in-out;
    -moz-transition: all 0.1s ease-in-out;
    -ms-transition: all 0.1s ease-in-out;
    -o-transition: all 0.1s ease-in-out;
}

.login-container form button:hover {
    box-shadow: 0 0 10px 1px rgba(0, 0, 0, 0.15);
    transform: scale(1.02);
    -webkit-transform: scale(1.02);
    -moz-transform: scale(1.02);
    -ms-transform: scale(1.02);
    -o-transform: scale(1.02);
}

.circle {
    width: 8rem;
    height: 8rem;
    background: var(--primary-color);
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
    position: absolute;
}

.illustration {
    position: absolute;
    top: -14%;
    right: -2px;
    width: 90%;
}

.circle-one {
    top: 0;
    left: 0;
    z-index: -1;
    transform: translate(-45%, -45%);
    -webkit-transform: translate(-45%, -45%);
    -moz-transform: translate(-45%, -45%);
    -ms-transform: translate(-45%, -45%);
    -o-transform: translate(-45%, -45%);
}

.circle-two {
    bottom: 0;
    right: 0;
    z-index: -1;
    transform: translate(45%, 45%);
    -webkit-transform: translate(45%, 45%);
    -moz-transform: translate(45%, 45%);
    -ms-transform: translate(45%, 45%);
    -o-transform: translate(45%, 45%);
}

.register-forget {
    margin: 1rem 0;
    display: flex;
    justify-content: space-between;
}
.opacity {
    opacity: 0.6;
}

.theme-btn-container {
    position: absolute;
    left: 0;
    bottom: 2rem;
}

.theme-btn {
    cursor: pointer;
    transition: all 0.3s ease-in;
}

.theme-btn:hover {
    width: 40px !important;
}

@keyframes wobble {
    0% {
        transform: scale(1.025);
        -webkit-transform: scale(1.025);
        -moz-transform: scale(1.025);
        -ms-transform: scale(1.025);
        -o-transform: scale(1.025);
    }
    25% {
        transform: scale(1);
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        -ms-transform: scale(1);
        -o-transform: scale(1);
    }
    75% {
        transform: scale(1.025);
        -webkit-transform: scale(1.025);
        -moz-transform: scale(1.025);
        -ms-transform: scale(1.025);
        -o-transform: scale(1.025);
    }
    100% {
        transform: scale(1);
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        -ms-transform: scale(1);
        -o-transform: scale(1);
    }
}

const themes = [
    {
        background: "#1A1A2E",
        color: "#FFFFFF",
        primaryColor: "#0F3460"
    },
    {
        background: "#461220",
        color: "#FFFFFF",
        primaryColor: "#E94560"
    },
    {
        background: "#192A51",
        color: "#FFFFFF",
        primaryColor: "#967AA1"
    },
    {
        background: "#F7B267",
        color: "#000000",
        primaryColor: "#F4845F"
    },
    {
        background: "#F25F5C",
        color: "#000000",
        primaryColor: "#642B36"
    },
    {
        background: "#231F20",
        color: "#FFF",
        primaryColor: "#BB4430"
    }
];

const setTheme = (theme) => {
    const root = document.querySelector(":root");
    root.style.setProperty("--background", theme.background);
    root.style.setProperty("--color", theme.color);
    root.style.setProperty("--primary-color", theme.primaryColor);
    root.style.setProperty("--glass-color", theme.glassColor);
};

const displayThemeButtons = () => {
    const btnContainer = document.querySelector(".theme-btn-container");
    themes.forEach((theme) => {
        const div = document.createElement("div");
        div.className = "theme-btn";
        div.style.cssText = `background: ${theme.background}; width: 25px; height: 25px`;
        btnContainer.appendChild(div);
        div.addEventListener("click", () => setTheme(theme));
    });
};

displayThemeButtons();

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