body {
    font-family: 'Arial', sans-serif;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 90%;
    padding: 20px 100px;
    background-color: #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #f0f0f0;
    z-index: 99;
}
.contaner
.logo {
    font-size: 5vm;
    color: #ffffff;
    user-select: none;
}
.navigation a {
    position: relative;
    font-size: 1.4em;
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    margin-left: 50px;
    right: 40px;
}
.navigation a:after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 3px;
    bottom: -6px;
    background-color: #ffffff;
    border-radius: 5px;
    transform: scaleX(0);
    transition: transform .5s;
}
.navigation a:hover::after {
    transform: scaleX(1);
}
.navigation button {
    width: 100px;
    height: 50px;
    font-size: 1.4em;
    background: transparent;
    border: 2px solid #ffffff;
    outline: none;
    border-radius: 6px;
    cursor: pointer;
    color: #ffffff;
    
}
.navigation button:hover {
    background-color: #ffffff;
    color: #333;
}

#box {
    width: 100vw;    
    height: 25vw;
    background-color: rgb(60, 255, 229);
    position: absolute;
    top: 16.81vw;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    cursor: pointer;
    z-index: 1;
}
#overlay {
    width: 100vw;    
    height: 25vw;
    background-color: #84ff65;
    position: absolute;
    top: 16.81vw;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    z-index: 0;
}
#resultBox {
    width: 99.8vw;
    height: 10vw;
    background-color: -#f0f0f0;
    position: absolute;
    top: 29.3vw;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: #333;
    border: 2px solid #ccc;
    border-radius: 5px;
}

#startButton {
    font-size: 4rem;
    background-color: #87d3ff;

    width: 100vw;    
    height: 25vw;
    top: 4.3vw;
    position: absolute;
    z-index: 2;
    border: #87ffff;
    color: #ffffff;
}
#about {
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
.footer {
    text-align: center;
    padding: 10px;
    background-color: #333;
    color: #fff;
    position: fixed;
    bottom: 0;
    width: 100%;
}
#loginForm {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    width: 400px;
    transform: translate(-50%, -50%);
    background-color: #fff;
    padding: 20px;
    border: 1px solid #000000;
    z-index: 100;
}

#loginForm label {
    display: block;
    margin-bottom: 10px;
}

#loginForm input {
    width: 90%;
    padding: 8px;
    margin-bottom: 15px;
}
#loginForm button {
    background-color: #333;
    color: #fff;
    padding: 10px;
    border: none;
    cursor: pointer;
}