@media (max-width: 625px) {
    /* index.html */

    @keyframes slide-out-tl {
    0% {
        top: 50%;
        left: 50%;
        width: 300px;
        height: 366px;
        transform: translate(-50%, -50%) scale(1);
    }
    100% {
        top: 25px;
        left: 35px;
        width: 64px;
        height: 80px;
        transform: translate(0, 0) scale(1);
    }
    }

    header {
        position: absolute;
        bottom: 128px;
        margin-top: 0;
        width: 90%;
        padding: 0;
    }

    #header-div {        
        display: flex;
        justify-content: space-between;
        width: 100%;
    }

    #sign-up-btn {
        width: 90px;
    }

    #main {
        width: 90%;
    }

    #login-div {
        height: 60%;
    }

    .input-divider {
        width: 90%;
    }

    #email-input, #password-input {
        width: 100%;
    }

    #wrong-password-div {
        width: 90%;
    }

    .wrong-password-div {
        width: 90%;
    }

    #btn-login-div {
        flex-direction: column;
        width: 60%;
    }

    #btn-login-div button {
        width: 100%;
        margin-bottom: 24px;
    }

    /* index.html (sign-up menu)*/

    #sign-up-div {
        width: 90%;
    }

    .menu-input {
        width: 100%;
    }

    /*summary.html*/

    .big-logo {
        display: none;
    }

    .mobile-logo {
        display: block;
        height: 48px;
        width: auto;
        margin-left: 5%;
    }

    .header-responsive {
        margin-left: 0;
        width: 100%;
        height: 8vh;
    }

    .header-and-icon {
        height: 100%;
    }

    .header-and-icon h2,
    .help-person-icon a {
        display: none;
    }

    main {
        margin-top: 8vh;
        margin-left: 0;
        margin-right: 0;
        margin-bottom: 0;
        width: 95%;
        padding: 0;
        scrollbar-width: none; /* für Firefox */
        -ms-overflow-style: none; /* für IE und Edge */
    }

    main::-webkit-scrollbar {
        display: none; /* für Chrome, Safari und Opera */
    }

    .title-main {
        padding: 0;
        padding-top: 10px;
        gap: 8px;
        display: flex;
        flex-direction: column;
        align-items: start;
        margin-bottom: 25px;
    }

    .full-screen-border {
        display: none;
    }

    .mobile-border {
        display: block;
    }

    .tasks-and-text {
        padding: 0;
        height: 436px;
        width: 100%;
    }

    .all-tasks {
        width: 100%;
    }

    .to-do, 
    .done,
    .urgent-and-date,
    .tasks-in-board,
    .tasks-in-progress,
    .awaiting-feedback {
        height: 132px;
    }

    nav {
        position: fixed;
        bottom: 0;
        top: auto;
        height: 10vh;
        width: 100%;
        font-size: 15px;
    }

    nav div {
        display: flex;
        flex-direction: row;
        height: 100%;
        justify-content: space-evenly;
    }

    .nav-item {
        padding: 10px 10px !important;
        display: flex;
        flex-direction: column;
        height: 100%;
        border-radius: 20px;
    }

    .nav-logo {
        padding: 0;
    }

    .legal-info {
        display: none;
    }

    /*addTask.html*/

    main h1 {
        padding-top: 10px;
    }

    .add-task-form {
        margin-bottom: 10px;
        height: 450px;
        display: flex;
        flex-direction: column;
        overflow: scroll;
        width: 100%;
    }

    .add-task-text-div,
    .add-task-select-div {
        width: 100%;
        margin-left: 0;
        margin-right: 0;
        margin-bottom: 10px;
    }

    .add-task-form-divider {
        display: none;
    }

    .add-task-importance-selection,
    #drop-down-users-input-div,
    #category-button,
    .subtask-div {
        margin-bottom: 24px !important;
    }

    #drop-down-users-input,
    #drop-down-users-input-img-div {
        margin-bottom: 0;
    }

    #required-div {
        display: none;
    }

    #required-div-mobile {
        display: flex;
    }

    #button-div {
        width: 100%;
        display: flex;
        justify-content: space-around;
        margin-bottom: 10vh;
    }

    /* board.html */

    .kanban-board,
    .board-header {
        padding: 0;
    }

    .board-header {
        display: flex;
        flex-direction: column;
        align-items: start;
        gap: 20px;
        margin-bottom: 20px;
    }

    .board-header-btns {
        width: 100%;
        justify-content: space-between;
    }

    .kanban-board {
        flex-direction: column;
        margin-bottom: 12vh;
    }

    #to-do-div,
    #in-progress-div,
    #await-feedback-div,
    #done-div {
        display: flex;
        overflow-x: auto;
        scrollbar-width: none; /* für Firefox */
        -ms-overflow-style: none; /* für IE und Edge */
        gap: 8px;
    }

    #to-do-div::-webkit-scrollbar,
    #in-progress-div::-webkit-scrollbar,
    #await-feedback-div::-webkit-scrollbar,
    #done-div::-webkit-scrollbar {
        display: none; /* für Chrome, Safari und Opera */
    }

    .kanban-task {
        min-width: 240px;
    }
}

@media (max-width: 750px) {
    
    #back-btn {
        right: 40%;
    }
}

@media (max-width: 1100px) {
    
    .nav-item {
       padding: 10px 40px
    }
}