body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(137deg, #fff, #000, #000);
    font-family: monospace;
    color: #fff;
}

.box {
    display: flex;
    flex-direction: row;
    width: max-content;
    height: auto;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 20px;
}

.btn {
    margin: 1.1rem;
    padding: 1.05rem;
    font-size: 1.2rem;
    cursor: pointer;
    border: none;
    border-radius: 0;
    height: 3.5rem;
    width: 13.7rem;
    outline: 0.21rem solid cyan;
    background-color: #000;
    color: #fff;
    transition: all 0.3s ease-in;
}
.btn:hover {
    background-color: cyan;
    color: #000;
}