popup.css

* {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
}

.container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100vh;
    background: #3c5077;
    position: relative;
}

.container form{
    width: 90%;
    max-width: 500px;
    padding: 50px 30px 20px;
    border-radius: 4px;
    background: #232424;
    box-shadow: -8px -8px 15px rgba(255, 255, 255, 0.1), 5px 5px 15px rgba(0, 0, 0, 0.2);
    background: transparent;
    top: 0;
    left: 0;
    position: relative;
}

.open-form {
    display: none;
}

.input-group{
    width: 100%;
    display: flex;
    align-items: center;
    margin: 10px 0;
    position: relative;
}
.input-group label{
    flex-basis: 28%;
}
.input-group input, .input-group textarea{
    flex-basis: 68%;
    background: transparent;
    border: 0;
    outline: 0;
    padding: 10px 0;
    border-bottom: 1px solid #999;
    color: #333;
    font-size: 16px;
}
::placeholder{
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}


.btn {
    background: #141a34;
    color: #fff;
    border-radius: 4px;
    padding: 10px 40px;
    outline: none;
    border: 0;
    cursor: pointer;
    margin: 30px auto 10px;
    display: block;
    position: absolute;
    top: 77%;
}

.btn:hover{
    background: #0c1025;
}

.popup {
    width: 400px;
    background: white;
    border-radius: 6px;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.1);
    text-align: center;
    padding: 0 30px 30px;
    color: #333;
    visibility: hidden;
    transition: transform 0.4s, top 0.4s;
}

.open-popup {
    visibility: visible;
    top: 50%;
    transform: translate(-50%, -50%) scale(1);
}

.popup img {
    width: 100px;
    margin-top: -50px;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.popup h2 {
    font-size: 38px;
    font-weight: 500;
    margin: 30px 0 10px;
}

.popup button {
    width: 100%;
    margin-top: 50px;
    padding: 10px 0;
    background: #6fd649;
    outline: none;
    border: 0;
    font-size: 18px;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
}