.custom_block_btn,
.acf-block-preview .custom_block_btn{
    color :  !important;
    background-color : ;
    border: px solid ;
    border-radius : px;
}
.custom_block_btn:hover{
    color :  !important;
    background-color : ;
    border-color: ;
}

@media only screen and (max-width: 500px){

}