如何在streamlit中修改选择框列长度？

st.write("""
<style>
div[role="listbox"] .Select-value {
    width: 500px !important;
}
</style>
""", unsafe_allow_html=True)

import streamlit as st

# 自定义CSS样式
st.write("""
<style>
div[role="listbox"] .Select-value {
    width: 500px !important;
}
</style>
""", unsafe_allow_html=True)

# 创建选择框
selected_option = st.selectbox("选择框", ["选项1", "选项2", "选项3"])

# 显示选择结果
st.write("你选择的是：", selected_option)