.container {
    margin: 0 auto;
    text-align: center;
}

.inline {
    display: inline-block;
}

.flexdiv {
    display: flex;
    align-items: center;
}

.flexdiv input {
    margin: 10px;
    padding: 0;
    box-sizing: border-box;
    border: 1px solid gray;
    border-radius: 2px;
    padding: 2px 3px;
}

.flexdiv p {
    flex: 0 0 auto;
}

.flexdiv label {
	margin-top: 10px;
}

.type_btn_group {
	display: flex;
	flex: 1;
}

.type_btn_group button {
	flex: 1;
	margin: 10px 5px;
}

.vertical_list {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.vertical_list input[type="button"] {
    width: 100%;
    margin: 5px;
}

#scene {
    border: 1px solid black;
}

#fast_select_popup, #level_popup, #settings_popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    background-color: #fff;
    border: 1px solid #ccc;
    z-index: 1500;
    box-sizing: border-box;
    width: max-content;
    max-width: calc(100vw - 20px);
    max-height: calc(100vh - 20px);
    overflow-y: auto;
}

#level_popup .flexdiv {
    flex-wrap: wrap;
}

#overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 900;
}