.font_size_75 {
    font-size: 90px;
}
.font_size_30 {
    font-size: 30px;
}
.font_size_25 {
    font-size: 42px;
}
.font_size_20 {
    font-size: 20px;
}
.font_size_16 {
    font-size: 16px;
}

.bold {
    font-weight: 900;
}
.white {
    color: #fff;
}
.black {
    color: #000;
}
.flex {
    display: flex;
}
.flex_direction_row {
    flex-direction: row;
}
.align_items_center {
    align-items: center;
}
.justify_content_center {
    justify-content: center;
}
.mb_20 {
    margin-bottom: 20px;
}

.hidden {
    display: none;
}
body {
    position: relative;
}
.logout_btn {
    position: fixed;
    bottom: 10px;
    left: 10px;

    background-color: #4FA7FF;
    color: #fff;
    padding: 10px;
    border-radius: 15px;
    transition: .3s;
    font-size: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}
.logout_btn i {
    color: #fff;
}
.logout_btn:hover {
    background-color: #4088cf;
}