app.css

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Roboto", sans-serif;
}

html,
body {
    background: #1d3354 center center no-repeat;
    opacity: 0.879;
    background-size: cover;
    display: flex;
    overflow: hidden;
    color: black;
    height: 100%;
    width: 100%;
    scroll-behavior: smooth;
}

.app {
    /* background-color: #467599; */
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    justify-content: center;
    padding-top: 20px;
    height: 100%;
    width: 50%;
}

#msg {
    visibility: hidden;
    color: red;
    font-weight: bold;
    font-size: 22px;
    font-family: Verdana;
    margin: 15px auto 15px auto;
}

button {
    text-transform: uppercase;
    color: #9ed8db;
    padding: 7px 10px;
    border-radius: 50px;
    border: 2.5px solid #9ed8db;
    font-size: 18px;
    font-weight: bold;
    background: transparent;
    transition: 0.4s ease-in-out;
    margin: 30px 5px;
}

button:hover {
    background: #9ed8db;
    cursor: pointer;
    color: black;
}

.audio-controls {
    display: flex;
    align-items: center;
    padding-top: 20px;
    justify-content: center;
}

.audio-controls button {
    margin: 0px 5px;
}

canvas {
    border-radius: 50px;
    background-color: black;
}

select {
    text-transform: uppercase;
    color: #9ed8db;
    padding: 5px 10px;
    border-radius: 50px;
    border: 2.5px solid #9ed8db;
    font-size: 18px;
    font-weight: bold;
    background: transparent;
    transition: 0.4s ease-in-out;
    margin: 30px 5px;
    height: 40px;
}

select:hover {
    background: #9ed8db;
    cursor: pointer;
    color: black;
}

a {
    text-decoration: none;
    color: inherit;
}

audio {
    height: 40px;
}

.app2 {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    justify-content: center;
    padding-top: 20px;
    height: 100%;
    width: 50%;
}

.app2_img1 {
    /* margin-bottom: 55px; */
    padding: 20px;
    width: 600px;
    height: 390px;
}

#resultText {
    margin: 30px;
    padding: 30px;
    /* visibility: hidden; */
    font-size: 50px;
    color: #9ed8db;
}

@media (max-width: 768px) {
    body {
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
        padding-top: 20px;
        height: 100%;
        width: 100%;
    }
}