style.css

textarea {
    font-family: monospace !important;
}

input {
    font-family: monospace !important;
}

h1 {
    padding-top: 0 !important;
}

[data-testid="stHorizontalBlock"] [data-testid="stHorizontalBlock"] {
    align-items: center;
}

[data-testid="stButton"] {
    display: flex;
    justify-content: center;
}

[data-testid="stVerticalBlock"]:has(> [data-testid="stPopover"]) {
    display: block;
}

[data-testid="stPopover"] {
    button {
        padding: 0;
        border: 0;

        div:first-of-type>p {
            font-size: small;
        }
    }

    button:active {
        background: white;
    }

    button:focus:not(:active) {
        color: rgb(49, 51, 63);
    }

    button:hover>div:first-of-type>p {
        text-decoration: underline;
    }
}

[data-testid="stSpinner"] {
    >div {
        display: flex;
        justify-content: center;
    }
}