.msgValue {
    position: absolute;
    /* position en bas a gauche */
    bottom: 0;
    left: 0;
    /* style */
    opacity: 0;
    flex-direction: column;
    text-align: center;
    background-color: #fff;
    width: 300px;
    margin: 20px;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    float: left;
    overflow: hidden;
    transition: opacity 0.5s ease-in-out;
    z-index: 1;

}

.msgGreenLoader {
    position : relative;
    width: 0;
    height: 10px;
    background-color: #4CAF50;
    bottom: 0;
    left: 0;
    animation: greenLoader 4s ease-in-out infinite;
}

@keyframes greenLoader {
    0% {
        width: 0;
        left: 0;
    }
    50% {
        width: 100%;
        left: 0;
    }
    100% {
        width: 0%;
        left: 100%;
    }
}

.msgValue#show {
    opacity: 1;
}