.header, .container {
    display: flex;
    justify-content: center;
}

h1 {
    font-size: 70px;
    background: linear-gradient(to right, #397fd2, #de4688);
    -webkit-text-fill-color: transparent;
    -webkit-background-clip: text;
}

.field {
    padding: 10px;
    width: 40%;
    border: none;
}

.btn {
    padding: 20px;
    background: #397fd2;
    border: none;
}

body {
    background-image: url(dog.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    min-height: 100vh;
    background-position: center;
    background-color: #397fd2;
}

.toDoAdded {
    background: #de4688;
    list-style-type: none;
    height: 50px;
    width: 50%;
    text-align: center;
    color: #fff;
    font-size: 20px;
    border-bottom: 1px solid #d09ab1;

}

.toDoContainer {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.complited {
    background: #237d77;
    color: black;
    font-weight: bold;
    text-decoration: line-through;
    transition: all 1s ease;
}

@media all and (max-width: 800px) {
    h1 {
        font-size: 40px;
    }
}

@media all and (max-width: 500px) {
    h1 {
        font-size: 20px;
    }
}