estilos.css

@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,500;1,500&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,500;1,500&display=swap');

html {
    scroll-behavior: smooth;
    height: 100%;
}

body {
    margin: 0;
    font-size: 25px;  
    height: 100%;
}

nav {
    background-color: rgb(44, 43, 43);
    padding-top: 15px;
    padding-bottom: 5px;
}

nav ul {
    list-style-type: none;
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin: 0;
}

#menu ul {
    list-style-type: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-left: 5em;
    padding-right: 5em;
    font-size: 25px;
}

#creditos {
    list-style-type: square;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 2em 20em;
    flex-wrap: wrap;
    justify-content: center;
}

#creditos li{
    font-family: 'Roboto', sans-serif;
    font-size: 50px;
}

h1, 
h2, 
a {
    font-family: 'Roboto', sans-serif;
}

h1 {
    font-size: 120px;
    padding: 15px 25px 15px 25px;
}

a {
    border-bottom: 0px solid rgba(255, 255, 0);
    margin-bottom: 0px;
    transition: all 100ms ease;
    color: white;
    text-decoration: none;
    background-color: transparent;
}

#pagina-selecionada {
    border-bottom-width: 5px;
}

a:hover, 
#comecar h1:hover{
    border-bottom-width: 5px;
}

p {
    font-family: 'Roboto', sans-serif;
    text-align: center;
    padding-left: 50px;
    padding-right: 50px;
    font-size: 50px;
}

 #losango {
    background-color: yellow;
    font-size: 35px;
    width: 1em;
    height: 1em;
    line-height: 1em;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    position: fixed;
    right: 0;
    bottom: 0;
    margin: 15px 15px;
    transform: rotate(45deg);
} 

#volta-para-o-topo {
    font-size: 35px;
    width: 1em;
    height: 1em;
    line-height: 1em;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    position: fixed;
    right: 0;
    bottom: 0;
    margin: 15px 15px;
    color: black;
}

.fundo-amarelo {
    background-color: yellow;
    color: black;
    padding-left: 40px;
    padding-top: 40px;
    padding-right: 5px;
    margin-right: 10px;
}

canvas {
    border-top: 3px solid black;
}

#controles {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-evenly;
    height: 121px;
    background-color: rgb(44, 43, 43);
}

#play {
    border: 0;
    background: transparent;
    box-sizing: border-box;
    width: 0;
    height: 74px;
    border-color: transparent transparent transparent yellow;
    transition: 100ms all ease;
    cursor: pointer;
    border-style: solid;
    border-width: 37px 0 37px 60px;
}

#play.playing {
    border-style: double;
    border-width: 0px 0 0px 60px;
}

#play:hover {
    border-color: transparent transparent transparent rgb(185, 185, 0);
}

#bpmcontainer {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

#bpmcontainer p {
    margin: 0;
    padding: 0px 10px 6px 0px;
}

#inputbpm {
    border: 2px solid black;
    border-radius: 10%;

    width: 50px;
    font-size: 19px;
    color: yellow;
    background-color: rgb(44, 43, 43);
}

.slidecontainer {
    width: 100%; /* Width of the outside container */
    height: 28px;
}
  
  /* The slider itself */
.slider {
    -webkit-appearance: none;  /* Override default CSS styles */
    appearance: none;
    width: 400px; /* Full-width */
    height: 25px; /* Specified height */
    background: #7a7a7a; /* Grey background */
    outline: none; /* Remove outline */
    opacity: 0.7; /* Set transparency (for mouse-over effects on hover) */
    -webkit-transition: .2s; /* 0.2 seconds transition on hover */
    transition: opacity .2s;
}

/* Mouse-over effects */
.slider:hover {
    opacity: 1; /* Fully shown on mouse-over */
}

/* The slider handle (use -webkit- (Chrome, Opera, Safari, Edge) and -moz- (Firefox) to override default look) */
.slider::-webkit-slider-thumb {
    -webkit-appearance: none; /* Override default look */
    appearance: none;
    width: 25px; /* Set a specific slider handle width */
    height: 25px; /* Slider handle height */
    background: yellow; /* Green background */
    cursor: pointer; /* Cursor on hover */
}

.slider::-moz-range-thumb {
    width: 25px; /* Set a specific slider handle width */
    height: 25px; /* Slider handle height */
    background: #04AA6D; /* Green background */
    cursor: pointer; /* Cursor on hover */
}

#tutorial p {
    font-size: 1em;
    text-align: center; 
    margin-bottom: 200px;
}

img {
    display: block;
    margin-left: auto;
    margin-right: auto;
   
}
 
@media (max-width: 1000px) {
    body {
        width: 100%;
    }
}

@media (max-width: 930px) {
    .slidecontainer {
        display: none;
    }
}

@media (max-width: 699px) {

    nav {
        height: 98%;
        position: fixed;
        top: 0px;
    }

    nav ul {
        height: 100%;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        margin-top: 0;
        margin-bottom: 0;
        padding-left: 20px;
        padding-right: 20px;
    }

    main {
        padding-left: 134px;
    }

    h1 {
        font-size: 90px;
    }

    .not-canvas {
        display: flex;
    }

    .p-responsive {
        font-size: 3rem;
    }

    .p-responsive2 {
        font-size: 2rem;
    }
} 


.checkbox input {
    display: none;
}


.checkbox label {
    position: relative;
    display: block;
    height: 20px;
    width: 44px;
    background: black;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.checkbox input :checked  {
    background: black;
}

.checkbox label:after {
    position: absolute;
    left: -2px;
    top: -3px;
    width: 26px;
    height: 26px;
    border-radius: 100px;
    background: white;
    box-shadow: 0px 3px 3px rgba(0,0,0,0.05);
    content: '';
    transition: all 0.3s ease;
}

.checkbox input:checked ~ :after {
    left: 20px;
    background: white;
   }

.checkbox label:active:after {
 transform: scale(1.15, 0.85);
}

.modoClaro {
    background-color: white;
    color: black;
    transition: 0.5s ease-in-out;
}

.modoEscuro {
    background-color: black;
    color: white;
    transition: 0.5s ease-in-out;
}