style.css

 *{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-style: 'sans-serif';
    
}

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

 .overlay {
    background-color: rgba(0, 0, 0, 0.5); 
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    position: absolute;
    opacity: 0.5;
  } 
  
  .segment-one {
    
    top: 0;
    left: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-image: url('bg-image.jpg');
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-blend-mode: darken;
    z-index: 1;
  }
  
  

.segment-two
{
    height: 100vh;
    
    
}
.add-form{
    display: flex;
    flex-direction: column;
    z-index: 3;
    border: 5px solid;
    border-radius: 20px;
    margin-top: 2rem;
    padding: 2rem;
    background-color: rgb(52, 50, 50);
    
}
.segment-one {
    color: white;
}

.options{
    display: flex;
    justify-content: space-around;
}  

input, button{
    margin-top: 8px;
    margin-bottom: 8px;
}

.segment-two{
    padding: 3rem;
    display: flex;
    flex-wrap: wrap;
    
    align-items: baseline;
    justify-content: space-around;
}

.book-item{
    border: 5px;
    background-color: aquamarine;
    border-radius: 20px;
    padding: 1rem;
    margin: 2rem;
}

.Delete{
   background-color: red;
   color: white;
   padding: 0.15rem;
   border-radius: 5px;
}
.Read-Unread{
    background-color: rgb(78, 146, 78);
   color: white;
   padding: 0.15rem;
   border-radius: 5px;
}
 
.Delete:hover, .Read-Unread:hover{
    opacity: 0.5;
}