style.css

body {
    background-color: #111 !important;
    color: #fff !important;
}
.title {
    text-align: center;
    font-size: 2.5rem;
    color: #00f5d4;
}
h1, h2, h3, .stTextInput label {
    color: rgb(62, 2, 6);
}
hr {
    margin-top: 2rem;
    border: 1px solid #444;
}
.stTextInput input, .stNumberInput input {
    background-color: #222;
    color: #0ff;
}
.stButton>button {
    background-color: #00f5d4;
    color: black;
    font-weight: bold;
    border-radius: 10px;
}