body {
    background-image: linear-gradient(yellow, white);
    width: 1000px;
    height: 770px;
}
.task {
    position: absolute;
    left: 35%;
    top: 30%;
    width: 300px;
    height: 50px;
    font-size: 25px;
    border: 4px solid red;
    /*border-radius: 5%;*/
}
.add_btn {
    position: absolute;
    left: 60%;
    top: 30%;
    height: 57px;
    width: 70px;
    border: 4px solid red;
    font-size: 20px;
}

.add_btn:hover {
    background-color: red;
}
.tasks {
    position: absolute;
    top: 45%;
    left: 35%;
}
.Task {
    width: 300px;
    height: 40px;
    border: 4px solid black;
    background-color: #87cefa;
    font-size: 25px;
    margin-bottom: 5px;
}

.btn {
    position: absolute;
    background-color: DodgerBlue;
    border: none;
    color: white;
    padding: 12px 16px;
    font-size: 16px;
    cursor: pointer;
    left: 363px;
}