styles.css

@import url('https://fonts.googleapis.com/css?family=Spartan&display=swap');
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    font-family: 'Spartan', ;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-image: url(https://images.unsplash.com/photo-1552840687-b25e05d08047?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=750&q=80);
}
.box {
    width: 500px;
    background-color: #ffffffd5;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    border-radius: 3px;
    box-shadow: 5px 10px 5px #00000052;
}
.box .tool-box{
    border-radius: 3px;
    position: absolute;
    top: -35px;
    left: 3%;
    display: flex;
    flex-direction: row;
}
.box .tool-box ul{
    background-color: #ffffffd5;
    list-style: none;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    box-shadow: 1px 2px 1px #00000055;
    margin: 0 5px;
}
.box .tool-box ul li{
    padding: 5px 10px;
    transition: all .5s;
}
.box .tool-box ul li:hover{
    background-color: #000;
    color: white;
}
.b{font-weight: bold;}
.i{font-style: italic;}
.u{text-decoration: underline;}
.s{text-decoration: line-through;}
.add{
    background-color: #ddd;
    text-align: center;
    padding: 5px;
    transition: .5s;
}
.add:hover{background-color: #03a9f4;}
.box .text{
    padding: 10px 20px;
    overflow: hidden;
}
.box .text-box{
    display: flex;
    flex-direction: row;
}
.box input[type="text"]{
    background-color: transparent;
    padding: 10px 0 0 0;
    border: none;
    width: 100%;
}
.box .text .text-box .input-link{
    width: 95%;
    text-decoration: none;
    color: #03a9f4;
}
.box .text-box span{
    transition:all .5s;
    align-self: center;
    padding: 3px 5px 0 5px;
    border-radius: 2px;
}
.box .text-box span:hover{
    background-color: red;
    color: white;
}
i{pointer-events: none;}