.header-button a {
    background-color: red;
    color: yellow;
    padding: 0px 15px;
    font-size: 18px;
    line-height: 38px;
    border-radius: 10px;
    border: 1px solid #FFEC8B;
    margin: 10px 0 10px;
    text-decoration: none;
    animation: okvip 2s infinite;
}


@keyframes okvip{
  0% {
    transform: scale(0.9);
    border-radius: 5px;
    box-shadow: 0 0 0 0 rgb(255 0 0 / 70%), 0 0 0 0 rgb(251 255 0 0.98 / 70%);
}

40% {
    border-radius: 5px;
    transform: scale(1);
       box-shadow: 0 0 0 10px rgb(228 255 0 / 21%), 0 0 0 0 rgb(255 247 0 / 94%);
}
80% {
    border-radius: 5px;
    transform: scale(1);
    box-shadow: 0 0 0 10px rgb(255 0 0 / 0%), 0 0 0 20px rgb(255 0 0 / 0%);
}
100% {
    border-radius: 5px;
    transform: scale(0.9);
    box-shadow: 0 0 0 0 rgb(255 0 0 / 0%), 0 0 0 20px rgb(255 0 0 / 0%);
}
}

}
@media (min-width: 768px) {
    main h2,h1,h3,h4 {
        width: 100%;
        border-radius: 10px;
        color: white;
        font-size: 22px;
        padding: 8px !important;
        background-color: #004848;
        margin-top: 8px;
        margin-bottom: 8px;
    }
}
.col-inner h1 {
      background: transparent !important;
}


.buttondk {
    background-color: red;
    color: yellow;
  font-size: 14px; /* Kích thước chữ */
  width: 100%; /* Chiều rộng của nút */
  height: 40px; /* Chiều cao của nút */
    border-radius: 10px;
    border: 1px solid #FFEC8B;
    margin: 1px  1px;
    text-decoration: none;
    animation: facai 2s infinite;
}


@keyframes facai{
  0% {
    transform: scale(0.9);
    border-radius: 5px;
    box-shadow: 0 0 0 0 rgb(255 0 0 / 70%), 0 0 0 0 rgb(251 255 0 0.98 / 70%);
}

40% {
    border-radius: 5px;
    transform: scale(1);
       box-shadow: 0 0 0 10px rgb(228 255 0 / 21%), 0 0 0 0 rgb(255 247 0 / 94%);
}
80% {
    border-radius: 5px;
    transform: scale(1);
    box-shadow: 0 0 0 10px rgb(255 0 0 / 0%), 0 0 0 20px rgb(255 0 0 / 0%);
}
100% {
    border-radius: 5px;
    transform: scale(0.9);
    box-shadow: 0 0 0 0 rgb(255 0 0 / 0%), 0 0 0 20px rgb(255 0 0 / 0%);
}