html, body {
    margin: 0;
    padding: 0;

    background: #000;

    font-family: 'Lato', sans-serif;
    color: white;

}


#intro-container {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: black;
}


#intro-container #intro-progress {
    position: absolute;
    top: 50%;
    left : 50%;
    transform: translateY(-50%) translateX(-50%);

    font-size: 20px;
    font-weight: 700;
}


#intro-container #intro-begin {
    display: none;
    position: absolute;
    top: 50%;
    left : 50%;
    transform: translateY(-50%) translateX(-50%);
    z-index: 10;

    cursor : pointer;

    font-size: 20px;
    font-weight: 700;

}

#intro-container #intro-circles {
    position: relative;

    width: 85vh;
    max-width: 95vw;
    height: 85vh;
    max-height: 95vw;
}

/*#intro-container #intro-circles:after {*/
   /*content: "";*/
    /*display: block;*/
    /*padding-bottom: 100%;*/
/*}*/


#intro-container div.circle{
    position: absolute;
    top: 50%;
    left : 50%;
    transform: translateY(-50%) translateX(-50%);

    border-width: 5px;
    border-style: solid;
    border-radius: 50%;
    opacity:0;
    /*will-change: border-color;*/
}



#intro-container div.circle:nth-child(1){

    width: 100%;
    height: 100%;
}

#intro-container div.circle:nth-child(2){
    width: 90%;
    height: 90%;
}

#intro-container div.circle:nth-child(3){
    width: 80%;
    height: 80%;
}

#intro-container div.circle:nth-child(4){
    width: 70%;
    height: 70%;
}

#intro-container div.circle:nth-child(5){
    width: 60%;
    height: 60%;
}

#intro-container div.circle:nth-child(6){
    width: 50%;
    height: 50%;
}

#intro-container div.circle:nth-child(7){
    width: 40%;
    height: 40%;
}

#intro-container div.circle:nth-child(8){
    width: 30%;
    height: 30%;
}

#intro-container div.circle:nth-child(9){
    width: 20%;
    height: 20%;
}

#intro-container div.circle:nth-child(10){
    width: 10%;
    height: 10%;
}




/*Option */

#option-container {
    display: none;
    position: absolute;
    top: 0;
    letter-spacing: 0;
    background-color: rgba(0, 0, 0, 0.15);
    flex-direction: column;
    align-items: center;
    padding: 10px;

    border-bottom-right-radius: 12px;
}

#option-container > div {
    display: flex;
    flex-direction: column;
    align-items: center;
    /*margin: 4px 0;*/

}

#option-container > div[id^="radio"] {
    flex-direction: row;
}

#option-container > div[id^="radio"] label{
    cursor: pointer;
}

#option-container > div[id^="radio"] input {
    margin-left: 10px;
}




#option-container > div input {
   margin: 10px 0;
}


input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    margin: 5px 0;
}
input[type=range]:focus {
    outline: none;
}
input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 3px;
    cursor: pointer;
    box-shadow: 0px 0px 0px #000000, 0px 0px 0px #0d0d0d;
    background: #ffffff;
    border-radius: 3px;
    border: 0px solid rgba(0, 1, 1, 0);
}
input[type=range]::-webkit-slider-thumb {
    box-shadow: 0px 0px 0px rgba(0, 0, 0, 0), 0px 0px 0px rgba(13, 13, 13, 0);
    border: 0px solid rgba(0, 0, 0, 0);
    height: 13px;
    width: 13px;
    border-radius: 12px;
    background: #ffffff;
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -5px;
}
input[type=range]:focus::-webkit-slider-runnable-track {
    background: #ffffff;
}
input[type=range]::-moz-range-track {
    width: 100%;
    height: 3px;
    cursor: pointer;
    box-shadow: 0px 0px 0px #000000, 0px 0px 0px #0d0d0d;
    background: #ffffff;
    border-radius: 3px;
    border: 0px solid rgba(0, 1, 1, 0);
}
input[type=range]::-moz-range-thumb {
    box-shadow: 0px 0px 0px rgba(0, 0, 0, 0), 0px 0px 0px rgba(13, 13, 13, 0);
    border: 0px solid rgba(0, 0, 0, 0);
    height: 13px;
    width: 13px;
    border-radius: 12px;
    background: #ffffff;
    cursor: pointer;
}
input[type=range]::-ms-track {
    width: 100%;
    height: 3px;
    cursor: pointer;
    background: transparent;
    border-color: transparent;
    color: transparent;
}
input[type=range]::-ms-fill-lower {
    background: #f2f2f2;
    border: 0px solid rgba(0, 1, 1, 0);
    border-radius: 6px;
    box-shadow: 0px 0px 0px #000000, 0px 0px 0px #0d0d0d;
}
input[type=range]::-ms-fill-upper {
    background: #ffffff;
    border: 0px solid rgba(0, 1, 1, 0);
    border-radius: 6px;
    box-shadow: 0px 0px 0px #000000, 0px 0px 0px #0d0d0d;
}
input[type=range]::-ms-thumb {
    box-shadow: 0px 0px 0px rgba(0, 0, 0, 0), 0px 0px 0px rgba(13, 13, 13, 0);
    border: 0px solid rgba(0, 0, 0, 0);
    height: 13px;
    width: 13px;
    border-radius: 12px;
    background: #ffffff;
    cursor: pointer;
    height: 3px;
}
input[type=range]:focus::-ms-fill-lower {
    background: #ffffff;
}
input[type=range]:focus::-ms-fill-upper {
    background: #ffffff;
}


/*Credits*/

#credits-container {
    font-size: 14px;
    text-align: right;
    position: absolute;
    bottom: 0;
    right: 0;
    padding: 16px;
    display: flex;
    flex-direction: column;

}

#credits-container a {
    text-decoration: none;
    color: inherit;

    font-weight: 700;

 }

#credits-container > div {
    margin: 3px 0;

 }