Email.css

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    display: grid;
    place-items: center;
    height: 100vh;
    background-color: transparent;
    background-image: url(checkmark.gif);
    background-position: center;
    background-size: cover;
    color: aliceblue;
}

.container {
    height: 250px;
    width: 450px;
    background:none;
    box-sizing: 2px 2px 8px rgba(0, 0, 0, 0.7), -2px -2px 8px rgb(74, 5, 5);
}
.container h2 {
    text-align: center;
    margin: 30px 0px;
    font-size: 27px;
}
.email {
    height: 50px;
    width: 400px;
    outline: auto;
    background: transparent;
    padding: 0px 20px;
    color: violet;
}
.h3 {
    height: 50px;
    width: 400px;
    margin: 0px 25px;
}
.check {
    height: inherit;
    width: auto;
    border: none;
    outline: auto;
    background: violet;
    padding: 0px 20px;
    margin: 14px 25px;
    cursor: pointer;
    font-weight: 600;
}