Fyiad

<div id="pomodoro-container">
    <div id="interval-container">
        <button id="pomodoro-interval-btn" class="interval-btn">Pomodoro</button>
        <button id="short-break-interval-btn" class="interval-btn">Short Break</button>
        <button id="long-break-interval-btn" class="interval-btn">Long Break</button>
    </div>
    <div id="timer-container">
        <div id="time-left">25:00</div>
    </div>
    <div id="start-stop-reset-container">

Fyiad

<div id="pomodoro-container">
    <div id="interval-container">
        <button id="pomodoro-interval-btn" class="interval-btn">Pomodoro</button>
        <button id="short-break-interval-btn" class="interval-btn">Short Break</button>
        <button id="long-break-interval-btn" class="interval-btn">Long Break</button>
    </div>
    <div id="timer-container">
        <div id="time-left">25:00</div>
    </div>
    <div id="start-stop-reset-container">