.trin-trin {
    animation: trin 3.5s linear infinite;
    animation-delay: 5s;
    animation-timing-function: linear;
}

.icon-phone {
    display: inline-block;
}

@keyframes trin {
    0% {
        transform: rotate(0deg);
    }

    3% {
        transform: rotate(15deg);
    }

    6% {
        transform: rotate(-15deg);
    }

    9% {
        transform: rotate(10deg);
    }

    12% {
        transform: rotate(-10deg);
    }

    15% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(0deg);
    }
    /* سکون کامل تا پایان */
}