```css
*{
margin:0;
padding:0;
box-sizing:border-box;
font-family:Arial,sans-serif;
}

body{
background:#f4f6f9;
padding:20px;
}

.container{
max-width:1200px;
margin:auto;
}

header{
text-align:center;
margin-bottom:20px;
}

.card{
background:white;
padding:20px;
border-radius:10px;
margin-bottom:20px;
box-shadow:0 2px 8px rgba(0,0,0,.1);
}

input{
width:100%;
padding:10px;
margin:8px 0;
border:1px solid #ccc;
border-radius:5px;
}

button{
background:#2563eb;
color:white;
padding:10px 15px;
border:none;
border-radius:5px;
cursor:pointer;
margin-right:5px;
}

button:hover{
background:#1d4ed8;
}

.delete{
background:red;
}

.edit{
background:orange;
}

table{
width:100%;
border-collapse:collapse;
}

table th,
table td{
padding:10px;
border:1px solid #ddd;
}

th{
background:#2563eb;
color:white;
}

@media(max-width:768px){

table{
display:block;
overflow-x:auto;
}

}
```