html {
    scroll-behavior: smooth;
}

body {
    background-color: rgb(241, 241, 226);
    color: black;
}
   
a {
    opacity: 1;
}

a:hover {
    opacity: 0.5;
}

.big {
    width: 250px;
    height: 250px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

#keyp {
    width: 300px;
    height: 250px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

#kaitenp {
    width: 760px;
    height: 950px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.oll {
    width: 750px;
    height: 950px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.ptn {
    display: block;
    margin-left: auto;
    margin-right: auto;
}

.va {
    width: 250px;
    height: 250px;
    border: solid rgba(82, 179, 79, 0.7);
    border-width: 1px;
}

.vb {
    width: 300px;
    height: 250px;
    border: solid rgba(82, 179, 79, 0.7);
    border-width: 1px;
}

h1 {
    font-size: 30px;
    text-align: center;
}

.intro {
    text-align: center;
}
    
h2 {
    font-size: 20px;
    background-color: #46a15f;
    padding: 5px;
    color: #ddffdd;
    text-align: center;
}

.solve {
    font-size: 15px;
    color: black;
    background-color: #d8ebba;
    background-size: contain;
}

p {
    font-size: 16px;
}

hr {
    border: none;
    background-color: #f0fff6;
    border-top: 2px dashed #117f33;
}

.pt {
    background-color: #daebea;
    padding: 30px 30px;
    width: 90%;
    margin: 10px auto;
    border-radius: 30px;
    box-shadow: 1px 1px 10px -5px rgba(0.3, 0.7, 0.4, 0.8);
}

.result {
    width: 30%;
    height: auto;
}

.brain {
    width: 600px;
    height: auto;
}

.dropmenu {
    list-style-type: none;
    display: flex;
    justify-content: center;
    width: 600px;
    margin: 0 auto;
    padding: 0;
}
  
.dropmenu li {
    background: #d8ebba;
    text-align: center;
    box-shadow: 1px 1px 1px rgba(82, 179, 79, 0.7) inset, -1px -1px 1px rgba(115, 139, 179, 0.7) inset;
    width: 25%;
    margin: 0;
    padding: 0;
    position: relative;
}

.dropmenu li ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    position: absolute;
    visibility: hidden;
    opacity: 0;
    perspective: 500px;
    z-index: 2;
}
  
.dropmenu li ul li {
    width: 100px;
}

.dropmenu li a {
    margin: 0;
    padding: 7px 0;
    display: block;
    color: #060500;
    font: bold 11px "游ゴシック", Helvetica;
    letter-spacing: 0.1em;
    text-decoration: none;
}

.dropmenu li a:hover {
    background: #39796d;
}

.dropmenu li:hover > a {
    background: #39796d;
}

.dropmenu li:hover ul {
    visibility: visible;
    opacity: 1;
}

.dropmenu li:hover li {
    transform: rotateY(0);
}
    
.dropmenu ul li:nth-child(2) {
    transition-delay: .1s;
}

.dropmenu ul li:nth-child(3) {
    transition-delay: .2s;
}

.dropmenu li:hover ul {
    visibility: visible;
    opacity: 1;
}

.dropmenu ul li {
    transform: rotateY(90deg);
    transform-origin: 50% 0;
    transition: .5s;
}

.under {
    background: linear-gradient(transparent 75%, #a8eaff 50%);
    background-size: 10px;
    color: #262929;
}

.stopwatch {
    text-align: center;
}

.time {
    font-size: 3em;
    margin-bottom: 20px;
}

button {
    padding: 10px 20px;
    font-size: 1em;
    margin-top: 20px;
    margin-bottom: 20px;
}

.scramble {
    margin-top: 20px;
    font-size: 1.2em;
}

.green {
    color: green;
}

#bestTime {
    color: blue;
}

.btn {
    display: inline-block;
    width: 170px;
    height: 75px;
    position: relative;
    font: bold 20px Helvetica;
    margin-left: 65%;
}

.btn-canvas {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
}

.btn-green {
    border-color: rgba(120, 190, 150, 1.0);
    background-color: rgba(120, 190, 150, 0.1);
}

.yami {
    width: 560px;
    height: 315px;
}

details {
    border-radius: 8px;
    border: solid 3px rgb(205, 218, 218);
}

details:hover {
    background: rgb(205, 218, 218);
}