client/themes/material/css/notification.css

/* Snackbar - Toast */

.snackbar,
.toast {
    box-shadow: 0px 3px 10px rgba(0, 0, 0, 0.23), 0px 3px 10px rgba(0, 0, 0, 0.16);
    position: fixed;
    z-index: 4;
    min-height: 6rem;
    max-height: 11rem;
    height: auto;
    color: white;
    padding: 2rem 3rem;
    box-sizing: border-box;
    width: 40rem;
    pointer-events: none;
    transition: opacity 0.2s ease, bottom 0.4s ease;
    transform: translateX(0);
}

.snackbar > a {
    pointer-events: auto;
    margin: -1rem -2rem;
    display: block;
    margin: -2rem -1rem;
    padding: 2rem 1rem;
}

.snackbar > a:hover {
    border: 3px solid rgba(255, 255, 255, 0.2);
    padding: calc(2rem - 3px) calc(1rem - 3px);
}

.snackbar p,
.toast p {
    color: white;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.snackbar {
    background-color: #333333;
    bottom: 3rem;
    left: 3rem;
    border-radius: 0.25rem;
    opacity: 1;
    padding: 2rem 1rem;
}

.toast {
    background-color: #323232;
    border-radius: 3rem;
    left: 50%;
    bottom: 3rem;
    line-height: 2.5rem;
    margin-left: -20rem;
}

.snackbar:empty,
.toast:empty {
    opacity: 0;
}

.snackbar#error_websocket {
    max-height: initial;
}

.snackbar#error_websocket p {
    line-height: 2.5rem;
    white-space: initial;
}

.snackbar#error_websocket:not(.hide) ~ main,
.snackbar#error_websocket:not(.hide) ~ nav,
.snackbar#error_websocket:not(.hide) ~ div:not(.toast) {
    opacity: 0.5;
    pointer-events: none;
}

@media screen and (max-width: 22rem) {
    .snackbar {
        width: 100%;
        top: 0;
        left: 0;
        bottom: auto;
        border-radius: 0;
    }

    .toast {
        max-width: 90%;
        left: 5%;
        margin-left: 0;
    }
}