index.css

body {
    display: flex;
    flex-direction: column;
    min-height: 100px;
    background-color: #bdd5ea;
    font-family: 'Times New Roman', Times, serif;

}

header {
    padding: 20px;
    max-width: 800px;
    width: 100;
    margin: 0 auto;
}

h1 {
    font-size: 33px;
    font-family: 'Times New Roman', Times, serif;
    text-align: center;
    margin-bottom: 40px;

}

#new-task-form {
    display: flex;
}


#NTinput {
    flex: content;
    background-color: #f7f7ff;
    padding: 10px;
    width: 200px;
    text-align: center;
    font-size: 20px;
    border: 2px bold black;
    border-radius: 8px;
}

#NTsubmit {
    flex: 1 1 0%;
    background-color: #f0e6d1;
    padding: 10px;
    width: 100px;
    text-align: center;
    font-size: 20px;
    border: 2px bold black;
    border-radius: 8px;
    margin: 0 auto;
    cursor: pointer;
    transition: 0.4s;
}

#NTsubmit:hover {
    opacity: 0.8;
}

#NTsubmit:active {
    opacity: 0.6;
}

main {
    flex: 1 1 0%;
    padding: 10px;
    max-width: 800px;
    width: 340px;
    margin: 0 auto;
}

.task-list {
    padding: 10px;
}

h2 {
    font-size: 28px;
}

#tasks .task {
    display: flex;
    justify-content: space-between;
}

#tasks .task .content .text {
    color: black;
    font-size: 16px;
    width: 170px;
    transition: 0.4s;
    border: 2px solid black;
    border-radius: 4px;
}

#tasks .task .content .text:not(:read-only) {
    color: #560bad;
}

#tasks .task .actions {
    display: flex;
    margin: 2px;
}

.task .actions button {
    cursor: pointer;
    height: 24px;
    border: 1px solid black;
    border-radius: 4px;
    text-transform: uppercase;
    transition: 0.4s;
}

.task .actions button:hover {
    opacity: 0.8;
}

.task .actions button:active {
    opacity: 0.6;
}

.task .actions .edit {
    background-color: #4895ef;
}

.task .actions .delete {
    background-color: #fe5f55;
}