.select2-selection--single { 
    padding: 3px 0;
    height: auto;
}
.kelas_hot {
    animation: blinker 1.5s linear infinite;
    background: #f25b2f;
    padding: 2px 10px;
    border-radius: 30px;
    color: #cff21d;
    font-size: 12px;
    font-weight: bolder;
    font-style: italic;
    font-family: cursive;
    box-shadow: 0px 0px 8px 3px #e37352;
}
@keyframes blinker {
    50% {
        opacity: 0;
    }
}