.w3-theme {
    color: #000 !important;
    background-color: #FFFF00 !important
}
.w3-btn {
    background-color: #FFFF00;
    margin-bottom: 4px
}
.w3-code {
    border-left: 4px solid #FFFF00
}
.myMenu {
    margin-bottom: 150px
}