* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
}
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(45deg, #ff00ff, #00ffff, #ff00ff, #00ffff);
    background-size: 400% 400%;
    animation: gradientBG 10s ease infinite;
  }
  
  @keyframes gradientBG {
    0% {
      background-position: 0% 50%;
    }
    50% {
      background-position: 100% 50%;
    }
    100% {
      background-position: 0% 50%;
    }
  }

header {
    background-color: #000400;
    color: white;
    padding: 1rem;
    text-align: center;
}

main {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    padding: 1rem;
}

form {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
    width: 100%;
}

input[type="text"],
input[type="date"],
input[type="time"] {
    flex-basis: calc(60% - 0.5rem);
    padding: 0.5rem;
    border-radius: 5px;
}

button {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 0.5rem;
    cursor: pointer;
    flex-basis: calc(40% - 0.5rem);
    margin-right: 1rem; 
    border-radius: 5px;
}
button:last-child {
    margin-right: 0;
}

button:hover {
    background-color: #3e8e41;
}

ul {
    flex-basis: 100%;
    list-style: none;
    padding: 0.5rem;
}

li {
    background-color: #f2f2f2;
    border-radius: 5px;
    margin-bottom: 0.5rem;
    padding: 0.5rem;
}

.completed {
    background-color: #d2f7d2;
}

@media (min-width: 600px) {
    main {
        justify-content: space-between;
    }

    form {
        flex-wrap: nowrap;
    }

    ul {
        flex-basis: 48%;
    }
}