How to center and coloured the button

I have an app which convert the image into pencil sketch in that app i need three changes in the buttons

1. Need to align the both buttons into center
2. Need to give some colour to the buttons
3. The both button should be in same size

Sample Code:

    import streamlit as st #web app and camera
    import numpy as np # for image processing 
    from PIL import Image #Image processing 

    import cv2 #computer vision 

def dodgeV2(x, y):
            return cv2.divide(x, 255 - y, scale=256)
        
def pencilsketch(inp_img):
            img_gray = cv2.cvtColor(inp_img, cv2.COLOR_BGR2GRAY)
            img_invert = cv2.bitwise_not(img_gray)
            img_smoothing = cv2.GaussianBlur(img_invert, (21, 21),sigmaX=0, sigmaY=0)
            final_img = dodgeV2(img_gray, img_smoothing)
            return(final_img)
        
def download_image(x):
    with open(x, "rb") as file:
                        btn = st.download_button(
                                label="Download image",
                                data=file,
                                file_name=x,
                                mime="image/jpg"
                            )

def email_box(x):
    if st.checkbox("Email"):
                    form = st.form(key='my-form')
                    name = form.text_input('Enter your name')
                    submit = form.form_submit_button('Send Email')
                    if submit:
                        st.write(f'x {name}')


file_image = st.camera_input(label = "Take a pic of you to be sketched out")
        
if file_image:
            input_img = Image.open(file_image)
            final_sketch = pencilsketch(np.array(input_img))
            st.write("**Output Pencil Sketch**")
            st.image(final_sketch, use_column_width=True)
            download_image("final_image.jpeg")
            email_box("hello")

else:
    st.write("You haven't uploaded any image file")
    

I have modified the above code. Hope it helps

customized_button = st.markdown("""
    <style >
    .stDownloadButton, div.stButton {text-align:center}
    .stDownloadButton button, div.stButton > button:first-child {
        background-color: #ADD8E6;
        color:#000000;
        padding-left: 20px;
        padding-right: 20px;
    }
    
    .stDownloadButton button:hover, div.stButton > button:hover {
        background-color: #ADD8E6;
        color:#000000;
    }
        }
    </style>""", unsafe_allow_html=True)