.vessel {
    position: absolute;
    top: -1vw;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 4px;
}

.box_U,
.box_C {
    width: 35vw;
    height: 70vh;
    margin: auto;
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    grid-gap: 10px;
    padding: 20px;
    background-color: #e5e5e5;
    border: 1px solid #ccc;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

.box_U>div,
.box_C>div {
    background-color: #fff;
    width: 1vw;
    padding: 20px;
    font-size: 18px;
    text-align: center;
    border: 1px solid #666;
    border-radius: 5px;
    transition: background-color 0.3s ease;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.box_U>div {
    border: 0.001px solid #666;
}

.text_C:hover {
    cursor: pointer;
    background-color: #e74c3c;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

.computer {
    font-size: 30px;
    color: #ffffff;
    font-weight: bold;
    padding: 4px;
    border-radius: 10px;
    box-shadow: 0 0 10px;
    text-align: center;
}

.choose {
    display: flex;
    flex-direction: column;
    gap: 1vh;
}

.ok1 {
    width: 5vw;
    margin: auto;
}

textarea[name="select"] {
    padding: 5px;
    font-size: 14px;
    border: none;
    border-radius: 10px;
    width: 200px;
    height: 50px;
    resize: vertical;
    background-image: linear-gradient(to bottom, #52bdff    , #000000);
    background-size: 100% 200px;
    background-position: 0% 100%;
    transition: background-position 0.3s;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    color: white;
  }
  
  textarea[name="select"]:focus {
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.4);
    background-position: 100% 100%;
  }
  
  textarea[name="select"]::placeholder {
    font-size: 18px; /* increased font size to 18px */
    color: #ccc;
  }
  
  textarea[name="select"]:hover {
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    background-position: 50% 100%;
  }

  @media screen and (max-width:1146px) {
    .vessel{
        flex-direction: column;
        justify-content: space-around;
        left: 9vw;
    }
    .ok1 {
        width: 20vw;
    }
    .box_C,.box_U{
        width: 107vw;
    }
  }
  @media screen and (max-width:345px) {
    .box_C,.box_U{
        width: 606vw;
    }
  }