.custom_block_btn,
.acf-block-preview .custom_block_btn{
    color : #ffd626 !important;
    background-color : #383838;
    border: 8px solid #383838;
    border-radius : 4px;
}
.custom_block_btn:hover{
    color : #383838 !important;
    background-color : #ffd626;
    border-color: #ffd626;
}

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

}