body {
    height: 100vh;
    background: linear-gradient(to top, #093f20 0%, #99c48e 75%);
    /* Dark Mode */
    /* background: linear-gradient(to top, hsl(0, 0%, 5%) 0%, hsl(0, 0%, 10%) 75%); */
    background-color: #99c48e;
    overflow-y: hidden;
    font-family: 'Source Sans Pro', sans-serif;
}

.title {
    font-size: 3em;
    font-weight: 700;
    color: #e4faf8;
    text-align: center;
    text-shadow: #093b3f 0px 0px 6px;
}

.grid {
    max-width: 410px;
    max-height: 600px;
    min-width: 300px;
    min-height: 300px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    width: 40%;
    height: 35%;
    margin: 0 auto;
    background-color: #1f283372;
    border-radius: 10px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.5);
}

.grid-item {
    margin: 5%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 50px;
    color: #c5c6c7;
    background-color: #1f2833;
    border-radius: 10px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.5);
}

.grid-item:hover {
    background-color: #8ec4c0;
    color: #1f2833;
}

.btn {
    transition: all 0.3s ease;
    display: block;
    background-color: #1f2833;
    color: #C5C6C7;
    font-size: 20px;
    font-weight: bold;
}

.btn-box {
    width: 200px;
    height: 60px;
    margin-left: 3%;
    margin-right: 3%;
    border: none;
    border-radius: 15px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.648);
}

.btn2 {
    display: block;
    margin-top: 2%;
    background-color: #443e44;
    color: #ffffff;
    font-size: 20px;
    font-weight: bold;
}

.btn2:hover {
    scale: 1.2;
    background-color: #e7b9ea;
    color: #1f2833;
}

.btn:hover {
    scale: 1.2;
    background-color: #45a29d0c;
}

.btn:disabled {
    background-color: #1f2833;
    color: #c5c6c7;
}

.btn-panel {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 50px;
}

.btn-assist {
    margin-top: 2%;
    position: absolute;
    top: 15%;
    left: 25%;
    width: 15%;
}

.ease {
    transition: all 0.3s ease;
}

/* opacity 1s transition animation */
.fade-in {
    opacity: 0;
    animation: fade-in 0.2s ease-in forwards;
}

.fade-out {
    opacity: 1;
    animation: fade-out 0.2s ease-in forwards;
}

@keyframes fade-in {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

@keyframes fade-out {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}