style.css

* {
    font-family: "Dosis";
    outline: none;
    border: none;
}

::placeholder {
    color: #000;
    opacity: 1;
}

:-ms-input-placeholder {
    color: #000;
}

::-ms-input-placeholder {
    color: #000;
}

body {
    text-align: center;
    display: grid;
    place-items: center;
    min-height: 100vh;
    margin: 0;
    transition: 1.5s;
}

#username-field {
    font-size: 60px;
}

#username-field h6 {
    font-style: italic;
    font-weight: normal;
}

#username-field i {
    font-size: 130px;
    margin: -16px 0 0 0;
    position: absolute;
}

#username-field input {
    text-align: center;
    font-size: 80px;
    border: 6px solid #000;
    background-color: transparent;
    border-radius: 100px;
    padding: 12px 0;
    transition: 1.5s;
}