style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    border: none;
}

.container {
    width: 100%;
    height: 100vh;
    background-image: linear-gradient(120deg, #d4fc79 0%, #96e6a1 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.useful-links {
    position: absolute;
    top: 5%;
    right: 5%;
}

.useful-links a {
    display: block;
    color: #fff;
    text-decoration: none;
}

.container form {
    width: 90%;
    max-width: 500px;
    padding: 50px 30px 20px;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    position: relative;
}



.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;
}

form button {
    background-image: linear-gradient(120deg, #f093fb 0%, #f5576c 100%);
    color: #fff;
    border-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.7);
    padding: 10px 40px;
    outline: 0;
    cursor: pointer;
    display: block;
    margin: 30px auto 10px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.06rem;

}

form button:hover {
    background-image: linear-gradient(120deg, #d4fc79 0%, #96e6a1 100%);
}

.fa-paper-plane {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #fff;
    font-size: 26px;
    padding: 20px;
    border-radius: 50%;
    box-shadow: rgba(240, 46, 170, 0.4) 0px 5px, rgba(240, 46, 170, 0.3) 0px 10px, rgba(240, 46, 170, 0.2) 0px 15px, rgba(240, 46, 170, 0.1) 0px 20px, rgba(240, 46, 170, 0.05) 0px 25px;

}

.input-group span {
    position: absolute;
    bottom: 12px;
    right: 17px;
    font-size: 12px;
    color: red;
}

.input-group span i {
    color: seagreen;
}

#submit-error {
    color: red;
    font-size: 12px;
}