* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(45deg, red, black, blue);
}

h3 {
    position: relative;
    font-size: 20px;
    color: #f9f9f9;
    letter-spacing: 1px;
    font-weight: 500;
    margin-bottom: 5px;
}

.form {
    position: relative;
}

.form .email {
    width: 300px;
    background: linear-gradient(60deg, blue, black, red);
    outline: none;
    border: none;
    padding: 10px;
    border-radius: 30px;
    color: rgb(255, 255, 255);
    font-style: 18px;
    -webkit-border-radius: 30px;
    -moz-border-radius: 30px;
    -ms-border-radius: 30px;
    -o-border-radius: 30px;
}

.form .email::placeholder {
    color: white;
}

.form .email:hover {
    border: 1px solid white;
}

.form .inputBox {
    position: relative;
}

.text {
    display: block;
    color: #000;
    font-weight: 300;
    font-style: italic;
    padding: 5px;
}

.form.invalid .inputBox::before {
    content: '';
    position: absolute;
    right: 12px;
    top: 10px;
    width: 20px;
    height: 24px;
    background: url(invalid.png);
    background-size: cover;
    z-index: 1000;
}

.form.valid .inputBox::after {
    content: '';
    position: absolute;
    right: 12px;
    top: 10px;
    width: 24px;
    height: 24px;
    background: url(valid.png);
    background-size: cover;
    z-index: 1000;
}