.dict-btn {
    position: fixed;
    bottom: 40px;
    right: 40px;
    padding: 13px;
    border-radius: 8px;
    box-shadow: 0 0 10px #333;
    width: 46px;
    height: 46px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #4973ff;
    color: #fff;
    font-size: 20px;
    transition: all 0.5s ease 0s;
    cursor: pointer;
    z-index: 5;
}
.dict-btn:hover {
    transform: scale(1.1);
    background-color: #28a745;
    box-shadow: 0 0 10px #fff;
}

.content-alert {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 5;
    border-radius: 10px;
    background-color: rgb(200, 200, 200);
    border: 2px solid #333;
    box-shadow: 0 0 10px #333;
}
.content-alert:not(.active) {
    opacity: 0;
    visibility: hidden;
}

.sheet-navigation-btns-bottom {
    position: fixed;
    bottom: 40px;
    z-index: 6;
}
.sheet-navigation-btns-right {
    position: fixed;
    right: 0px;
    top: calc(50% - 50px);
    z-index: 6;
}
.pdf-tab {
    transition: all 0.5s ease 0s;
    cursor: pointer;
}
.pdf-tab:hover,
.pdf-tab.active {
    transform: translate(-20px, 0);
}