index.css

* {
    box-sizing: border-box;
}
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

body {
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: "Arial", sans-serif;
    background-color: #011627;
}

.header {
    width: 100%;
    background-color: #00464f;
    color: #fdfffc;
    position: absolute;
    top: 0;
}

.header h2 {
    padding: 0.5em;
    text-align: center;
}
.landing-div {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /* padding: 20px; */
    /* border-radius: 15px; */
    max-width: 800px;
    font-weight: bold;
    text-align: center;
    word-wrap: break-word;
    overflow-wrap: break-word;
    margin: 0 auto;
    padding: 0 10px;
}
.justified-text {
    text-align: justify;
}
.landing-div h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
    text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.7);
}

#start-button {
    margin-top: 20px;
    padding: 15px 30px;
    border: none;
    background: linear-gradient(90deg, #f72585, #ff006e);
    color: #fdfffc;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
    transition: transform 0.2s, background-color 0.2s;
}

#start-button:hover {
    transform: scale(1.05);
    background: linear-gradient(90deg, #ff006e, #f72585);
}

.container {
    min-width: 50%;
    max-width: 1500px;
    height: 80%;
    background: linear-gradient(135deg, #ffffff, #e2e2e2);
    margin-top: 5rem;
    padding: 30px;
    box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    overflow-y: auto;
}

div.n-queen {
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* .inputbox {
    position: relative;
    margin-bottom: 2em;
    width: 100%;
} */

.inputbox {
    width: 100%;
    font-size: 16px;
    padding: 10px;
    background: #f9f9f9;
    border-radius: 35px;
    outline: none;
    position: relative;
    z-index: 1;
    box-shadow: inset 0 0 0 4px transparent;
    transition: box-shadow 0.3s ease-in-out;
    margin-bottom: 25px;
}

.inputbox:before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 25px;
    z-index: -1;
    background: linear-gradient(45deg, #f72585, #ff006e, #fa7921, #2ec4b6);
    padding: 4px;
    animation: rotateGradient 1s ease-in infinite;
}

@keyframes rotateGradient {
    0% {
        background: linear-gradient(45deg, #f72585, #ff006e, #fa7921, #2ec4b6);
    }
    15% {
        background: linear-gradient(315deg, #2ec4b6, #f72585, #ff006e, #fa7921);
    }
    25% {
        background: linear-gradient(135deg, #ff006e, #fa7921, #2ec4b6, #f72585);
    }
    35% {
        background: linear-gradient(315deg, #2ec4b6, #f72585, #ff006e, #fa7921);
    }
    50% {
        background: linear-gradient(225deg, #fa7921, #2ec4b6, #f72585, #ff006e);
    }
    65% {
        background: linear-gradient(45deg, #f72585, #ff006e, #fa7921, #2ec4b6);
    }
    75% {
        background: linear-gradient(135deg, #ff006e, #fa7921, #2ec4b6, #f72585);
    }
    85% {
        background: linear-gradient(315deg, #2ec4b6, #f72585, #ff006e, #fa7921);
    }
    100% {
        background: linear-gradient(315deg, #2ec4b6, #f72585, #ff006e, #fa7921);
    }
}

.numberbox {
    width: 100%;
    font-size: 16px;
    padding: 10px;
    border: none;
    border-radius: 35px;
    outline: none;
    transition: border-color 0.3s;
    background-color: #f9f9f9;
}

.numberbox:focus {
    border-color: #f72585;
}

.inputbox label {
    position: absolute;
    top: 23px;
    left: 25px;
    color: #2ec4b6;
    font-size: 14px;
    pointer-events: none;
    transition: 0.3s;
}

.inputbox input:focus ~ label,
.inputbox input:disabled ~ label,
.inputbox input:valid ~ label {
    top: -18px;
    font-size: 12px;
    font-weight: 400;
}

.slider-container {
    position: relative;
    width: 100%;
    margin-top: 2em;
}

.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 10px;
    background: #d1d1d1;
    outline: none;
    transition: background 0.3s;
}

.slider:hover {
    background: #b0b0b0;
}

.slider::after {
    content: "SLOW";
    position: absolute;
    top: -25px;
    font-size: 18px;
    font-weight: 700;
    color: #fa7921;
}

.slider::before {
    content: "FAST";
    position: absolute;
    top: -25px;
    right: 0px;
    font-size: 18px;
    font-weight: 700;
    color: #fa7921;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    background-color: #ffd200;
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.3s ease; /* Smooth transition */
}
.slider.green::-webkit-slider-thumb {
    background-color: green;
}

.slider.yellow::-webkit-slider-thumb {
    background-color: #ffd200;
}

.slider.red::-webkit-slider-thumb {
    background-color: red;
}
.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background-color: #fa7921;
    cursor: pointer;
    border-radius: 50%;
}

#progress-bar {
    width: 40%;
    height: 8px;
    background: #ffd200;
    border-radius: 10px;
    position: absolute;
    top: 7px;
    transition: background-color 0.3s ease; /* Smooth transition */
}

.play-button {
    margin-top: 20px;
    padding: 15px 30px;
    border: none;
    background: linear-gradient(90deg, #0162ff, #ff006e);
    color: #fdfffc;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
    transition: transform 0.2s, background-color 0.2s;
}

.play-button:hover {
    transform: scale(1.05);
    background: linear-gradient(90deg, #ff006e, #0162ff);
}
.queen-arrangement {
    margin-top: 20px;
    text-align: center;
    font-size: 18px;
    font-weight: 500;
    color: #247ba0;
}

#n-queen-board {
    display: flex;
    width: 100%;
    margin: 20px auto;
    flex-wrap: wrap;
    justify-content: center;
}

#n-queen-board div {
    display: flex;
    justify-content: center;
    flex-direction: column;
    margin: 0 10px;
    border-radius: 3px;
    bottom: 10px;
}

table {
    border-collapse: collapse;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 2);
    margin: 0 auto;
}

td {
    width: 35px;
    height: 35px;
    text-align: center;
    border: 1px solid #000;
}

h4 {
    padding: 8px;
    background-color: #0582ca;
    color: #fdfffc;
    text-align: center;
    border-radius: 4px;
}