#mc_embed_signup .mc-field-group select {
    width:100% !important;
}

#mc_embed_signup .button{
       background: #1a4a23 !important;
    border: none !important;
    padding: 10px 20px !important;
    margin: 0 10px 0 0!important; 
    border-radius: 10px !important;
    color: #ffffff!important;
height: auto !important;
}