*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    font-family: Arial, sans-serif;
    background: #f3f4f6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.container{
   width: 100%;
    max-width: 500px;
    background: #fff;   
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}
h1
{
   text-align: center;
    color: #111827;
    margin-bottom: 20px;
}
input{
    flex: 1;
    padding: 12px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
}
button{
    padding: 12px 16px;
    border: none;
    background: #2563eb;
    color: #fff;
    border-radius: 8px;
    cursor: pointer;

}
button:hover{
    opacity: 0.9;
}

#taskList{
    list-style: none;
    margin-top: 20px;
    padding: 0;
}

#taskList li{
   background: #f9fafb;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 10px;
    color: #111827;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}
#taskList li button{
    background: #ef4444;
    padding: 8px 12px;
    border: none;
    color: #fff;
    border-radius: 6px;
    cursor: pointer;
}
#taskList li button:hover{
    opacity: 0.9;
}
.completed{
    text-decoration: line-through;
    color: #9ca3af;
}