style.css

.main{
    background: skyblue;
    padding: 25px;
    max-width: 2260px;
    margin: 25px auto;
    overflow: hidden;
    border-radius: 10px;
    border: 4px solid black;
    position: relative;
}
.input{
    text-align: center;
    padding-top: 20px;
    padding-bottom: 50px;
    margin: 30px 0px 20px;
    border: 2px solid purple;
    border-radius: 5px;
}
#addNewTask{
    padding: 3px 8px;
}
input[type="submit"], .delete{
    background-color: green;
    color: white;
    padding: 3px 8px;
    margin-top: 10px;
}
#pendingTask, #completedTask{
    list-style: none;
    padding: 0px;
    margin: 0px;
}
.taskBox{
    padding: 10px 15px;
    border-radius: 5px;
    background: #fff;
    margin: 15px 0;
    width: 46%;
}
.taskBox h3{
    text-align: center;
}
.pending{
    border: 2px solid red;
    float: left;
}
.completed{
    border: 2px solid green;
    float: right;
}
.pendingTaskItems, .completedTaskItems{
    padding: 10px;
    border-bottom: 2px solid #ccc;
}
.delete{
    float: right;
    background-color: red;
    margin-top: 0px;
}
.credits{
    position: absolute;
    top: 0%;
    left: 43%;
}
.credits a{
    text-decoration: none;
    color: black;
    font-weight: bold;
    text-transform: uppercase;
}
.message{
    color: white;
    padding: 4px 8px;
}
@media (max-width: 1024px){
    .credits{
        left: 42%;
    }
}
@media (max-width: 1024px){
    .taskBox{
        width: 45%;
    }
    .credits{
        left: 35%;
    }
}
@media (max-width: 768px){
    .taskBox{
        width: 43%;
    }
}
@media (max-width: 425px){
    .taskBox{
        width: 37%;
    }
    .completedTaskItems{
        padding: 10px 0px;
    }
    .credits{
        left: 22%;
    }
}
@media (max-width: 375px){
    .taskBox{
        width: 35%;
    }
    .completedTaskItems{
        padding: 10px 22px 30px;
    }
    .credits{
        left: 18%;
    }
}
@media (max-width: 320px){
    .taskBox{
        width: 32%;
    }
    .completedTaskItems{
        padding: 10px 10px 30px;
    }
    .credits{
        left: 12%;
    }
}