html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    display: flex;

    background-color: #999;
    color: #fafafa;

    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.left-section {
    width: 33.33%;
    height: 100%;
    border: 5px solid black;
    box-sizing: border-box;

    display: flex;
    flex-direction: column;

    font-size: 3vh;
    font-weight: 512;

    background-color: #121212;
}

.center-section {
    width: 50%;
    height: 100%;
    box-sizing: border-box;

    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

#inventory {
    width: 100%;
    height: 50%;

    min-height: 120px;
    max-height: calc(100% - 120px);

    border-bottom: 2.5px solid black;

    box-sizing: border-box;
    resize: vertical; 
    overflow: auto;
    flex-shrink: 0;

    align-items: center;
    justify-items: center;
}

#shop {
    width: 100%;
    min-height: 120px;

    flex: 1;
    border-top: 2.5px solid black;
    box-sizing: border-box;
    overflow: auto;
}

#roll_btn {
    align-self: center;

    margin: 10px;

    display: flex;
    align-items: center;
    justify-content: center;

    font-size: 10vh;

    cursor: pointer;

    background-color: royalblue;
    border: 5px solid black;
    border-radius: 18px;
    height: 15%;
    width: 70%;

    transition: transform 0.1s ease-in-out, background-color 0.1s ease-in-out;
}

#roll_btn:hover {
    transform: scale(1.05);
    background-color: blue;
}

#roll_btn:active {
    transform: scale(0.95);
    background-color: darkblue;
}