*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: aqua;
    padding-top: 50px;
    flex-direction: column;
}
.pre{
    font-family: serif;
    font-size: 1.2rem;
    width: 90%;
    display: flex;
    text-wrap: initial;
    
}
button{
    background-color: aquamarine;
    outline: none;
    border: 2px solid #fff;
    border-radius: 5px;
    box-shadow: none;
    width: 200px;
    height: 50px;
    cursor: pointer;
    margin-bottom: 2rem;
}
button:hover{
    background-color: #fff;
    border: 2px solid grey;
    /*box-shadow: #fff 0px 10px 10px ;*/
    letter-spacing: 2px;
    font-weight: bold;
    transition: 0.5s;
}
.back{
position: fixed;
left: 20px;
bottom: 0px;
}
.imgb{
   background-image: url(./404.jpg);
   background-position: top;
   background-size: 70%;
}
.hide{
    content-visibility:hidden;background-color: #fff;
}