index.css

*{
    margin: 0px;
    padding: 0px;
    scroll-behavior: smooth;
}

body{
    display: flex;
    justify-content: center;
    background: url('img/bg.jpg') no-repeat center center fixed;
    background-size: cover;
}

#container{
    width: 50%;
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 10px 40px;
}

header h1{
    text-align: center;
    font-size: 2.3rem;
    margin: 15px 0px;
    padding: 8px;
}

#search{
    height: 40px;
    width: 400px; 
    font-size: 1.1rem;
    padding: 3px;
    margin: 12px;
    outline: none;
    border: 2px solid black;
    border-radius: 15px;
    /* border: none; */
}

#search::placeholder{
    color: grey;
    padding: 3px;
}

#search-box button{
    color: white;
    font-size: 18px;
}

#search-box button {
    background-color: gray;
    border: 2px solid black;
    border-radius: 12px;
    cursor: pointer;
    width: 120px;
}

#search-box button i {
    color: white;
    font-size: 1.1rem;
    padding: 10px 4px;
}


#menu{
    background-color: azure;
    border: 2px solid black;
    border-radius: 15px;
    padding: 12px 40px;
    margin: 20px 2px;
    display: flex;
    flex-direction: column;
    width: 280px;
}

#in-head{
    display: flex;
    justify-content: space-around;
}

#menu h3{
    font-size: 1.3rem;
}

/* #hide-show{
    float: right;
} */

#btn{
    font-size: 1.1rem;
    width: 80px;
    padding: 3px;
    cursor: pointer;
    background-color: grey;
    color: white;
    border: 2px solid black;
    border-radius: 12px;
}

.choice{
    display: flex;
    flex-direction: column;
}

.choice-box{
    margin: 2px;
    width: 240px;
}

.choice-box input{
    cursor: pointer;
}

#hide-content{
    /* display: none; */
}

#harbour, #western, #central{
    display: none;
}

#hide-content ul div a{
    text-decoration: none;
    color: black;
}

#hide-content ul div a:hover{
    text-decoration: underline;
}

#hide-content ul div a li{
    list-style: decimal;
    padding: 2px;
}

#content{
    text-align: center;
}

.box{
    width: 100%;
}

.box h3{
        font-size: 1.5rem;
        margin: 12px;
    }

.box img{
    width: 400px;
    margin-bottom: 24px;
}

#myBtn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: red;
    color: white;
    cursor: pointer;
    padding: 12px;
    border: 2px solid black;
    border-radius: 12px;
  }
  
  #myBtn:hover {
    background-color: #555;
  }

@media only screen and (max-width: 1100px){
    #search-box button{
        width: 40px;
    }

    #search-box button span{
        display: none;
    }
}


@media only screen and (max-width: 750px){
    body{
        background: none;
    }

    #container{
        width: 100%;
    }
}

@media only screen and (max-width: 960px){
    header h1{
        font-size: 2rem;
    }

    #search{
        height: 36px;
        width: 290px; 
    }

    form button i {
        padding: 6px;
    }

    #menu h3{
        font-size: 1.2rem;
    }

    .box h3{
        font-size: 1.3rem;
    }

    .box img{
        width: 250px;
        margin-bottom: 20px;
    }    
}

@media only screen and (max-width: 420px){
    #search{
        height: 34px;
        width: 240px; 
    }

    form button i {
        padding: 5px;
    }

    #menu{
        width: 250px;
    }
}

@media only screen and (max-width: 355px){
    header h1{
        font-size: 1.8rem;
    }

    #menu{
        width: 200px;
    }

    #search{
        height: 32px;
        width: 200px; 
    }

    form button i {
        padding: 4px;
    }

    #menu h3{
        font-size: 1.1rem;
    }

    .box h3{
        font-size: 1.2rem;
    }

    .box img{
        width: 150px;
        margin-bottom: 16px;
    }    
}