:root {
    --button-color: #dfdfdf;
    --theme-color: #384468
}

body {
    background-color: var(--theme-color);
}

.icon-hidden {
    display: none;
}

main {
    height: 100%;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.control-button {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    flex: 1 0 auto;

    width: 100%;
}

@media (orientation: portrait) {
    .control-icon {
        width: 6vw;
        height: 6vw;
    }
}
@media (orientation: landscape) {
    .control-icon {
        width: 6vh;
        height: 6vh;
    }
}
.control-icon {
    fill: var(--theme-color);
}

@media (orientation: portrait) {
    #volume-up {
        border-bottom: 1vw solid var(--theme-color);
    }
    #volume-down {
        border-top: 1vw solid var(--theme-color);
    }
}
@media (orientation: landscape) {
    #volume-up {
        border-bottom: 1vh solid var(--theme-color);
    }
    #volume-down {
        border-top: 1vh solid var(--theme-color);
    }
}

@media (orientation: portrait) {
    #noise-control {
        --button-size: 50vw;
    }
}
@media (orientation: landscape) {
    #noise-control {
        --button-size: 50vh;
    }
}
#noise-control {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    background-color: var(--button-color);

    width: var(--button-size);
    height: var(--button-size);

    padding: 0px;

    border: 0px;
    border-radius: 50%;
}