*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body{
    font-family: Arial, Tahoma;
}
.container .form{
    background-color: #f7f7f7;
    width: 600px;
    margin: 10px auto;
    padding: 20px;
    display: flex;
    justify-content: space-between;

}
.container .form .input{
    font-size: 34px;
    border: none;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    -ms-border-radius: 4px;
    -o-border-radius: 4px;
}

.container .form .add{
    font-size: 20px;
    background-color: red;
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    -ms-border-radius: 4px;
    -o-border-radius: 4px;
}
.container .tasks{
    background-color: #f7f7f7;
    height: fit-content;
    width: 600px;
    margin: 10px auto;
    margin-top: 20px;
    padding: 15px;
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}
.tasks .task{
    background-color:white;
    width: 550px;
    padding: 10px;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    -ms-border-radius: 4px;
    -o-border-radius: 4px;
    display: flex;
    justify-content: space-between;
}
.tasks .task:not(:last-child){
    margin-bottom: 15px;
}
.tasks .task:hover{
    background-color: #f7f7f7;
}
.tasks .task.done{
    opacity: 0.5;
}
.tasks .task span{
    font-weight: bold;
    font-size: 15px;
    background-color: red;
    padding: 2px 6px;
    color: white;
    border-radius: 4px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    -ms-border-radius: 4px;
    -o-border-radius: 4px;
    cursor: pointer;
}