*{
    margin: 0;
    padding: 0;
    background-color: #455A64;  
}

body{
    display: flex;
    flex-direction: column;
    justify-content: center;
}

h1{
    padding: 5px;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-weight: normal;
}

header{
    width: auto;
    height: 100px;
    padding-top: 30px;
    padding-bottom: 30px;
    text-align: center; 
}

.title{
    display: inline-block;
    text-align: center;
    font-size: 4em;
    color: white;
    font-family: Ruda;
}

.tooltip {
    display: inline-block;
    font-size: 2em;
    color: white;
    cursor: pointer;
  }
  
.tooltip .tooltip-text {
    visibility: hidden;
    width: 520px;
    background-color: rgb(219, 230, 226);
    opacity: 0.9;
    color:rgb(57, 62, 65);
    font-size: 20px;
    text-align: left;
    border-radius: 6px;
    padding: 20px 20px;
    position: absolute;
    z-index: 1;
}
  
.tooltip:hover .tooltip-text {
    visibility: visible;
  }

h2{
    padding-top: 50px;
    font-size: 1.8em;
    font-family: 'Courier Prime', monospace;
    text-align: center;
    color: aquamarine;
}


form{
    text-align: center;
    padding: 50px;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    color: aquamarine;
}

#txt{
    box-align: center;
    display:block;
    width:300px;
    height: 100px;
	padding: 5px;
	font-size:20px;
	color:whitesmoke;
	border: 3px solid aquamarine;
    background:rgb(57, 62, 65);
    margin: 0 auto;
    resize: none;
    outline:none;
    cursor: text;
}

.offset-label{
    font-size: 18px;
}

#offset{
    text-align: center;
    color:aquamarine;  
    width: 40px;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-size: 15px;
    color: rgb(57, 62, 65);
    background-color: aquamarine;
    border: 3px solid aquamarine;
    outline:none;
}

::selection,input::placeholder {
    background: aquamarine;
    color: rgb(57, 62, 65);
}

#option{
    width: 100px;
    padding: 5px;
    font-size: 15px;
    background-color: aquamarine;
    border: 3px solid aquamarine;
    outline:none;
}

#option:hover{
    color: aquamarine;
    background-color: rgb(57, 62, 65);
    border: 3px solid aquamarine;
    outline:none;
}

#clear,#copy{
    padding-top: 5px;
    cursor: pointer;
    width: 35px;
}

#btn-enviar{
    width: 150px;
    height: 75px;
    margin-top: 50px;
    font-size: 20px;
    background: aquamarine;
    color: rgb(57, 62, 65);
    border: 3px solid aquamarine;
    outline:none;
    -webkit-box-shadow: 9px 7px 5px rgba(50, 50, 50, 0.77);
    -moz-box-shadow:    9px 7px 5px rgba(50, 50, 50, 0.77);
    box-shadow:         9px 7px 5px rgba(50, 50, 50, 0.77);

}

#btn-enviar:hover{
    color: aquamarine;
    background-color: rgb(57, 62, 65); 
    border: solid aquamarine;
}