style.css

body {
    display: inline-block;
    max-width: 326px;
    width: 90%;
}
.tituloprincipal {
    text-align: center;
    font-size: 50px;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    color: #0A3871;
}
input {
    font-size: 30px;
    border-color: #0A3871;
    border-radius: 24px;
    width: 270px;
    height: 50px;
    margin-left: 10px;

    color:#0A3871
}
.button {
    margin-left: 10px;
}
button {
    display: inline;
    flex-direction: row;
    align-items: flex-start;
    padding: 24px;
    gap: 8px;

    width: 67px;
    height: 67px;

    background: #FFFFFF;
    border-radius: 24px;
    border-color: #0A3871;
    color:#0A3871;
    font-size: 16px;

    flex: none;
    order: 0;
    flex-grow: 0;
    margin-top: 10px;
}
#btnlimpar {
    width: 280px;
}
button:hover {
    background: #cfcdcd;
}