モダンリセットcss

自分でリセットcssを記述するよりもコピペして使用すれば楽です。
sassの場合は、_reset.scssというリセットcssだけのファイルを作りstyle.scssに@inportで呼び出せば
cssファイルを作らなくても良いので簡単です。

style.scssに記述する_reset.scssのファイルの読み込み

@import "_reset.scss";

/*!
 * ress.css • v1.2.2
 * MIT License
 * github.com/filipelinhares/ress
 * 全ての要素にbox-sizing: border-box;.
 * 全ての背景画像にbackground-repeat: no-repeat.
*/html{box-sizing:border-box;-webkit-text-size-
adjust:100%}*,:after,:before{background-repeat:no-repeat;box-
sizing:inherit}:after,:before{text-decoration:inherit;vertical-
align:inherit}*{padding:0;margin:0}audio:not([controls])
{display:none;height:0}hr{overflow:visible}article,aside,details,figcaptio
n,figure,footer,header,main,menu,nav,section,summary{display:block}su
mmary{display:list-item}small{font-size:80%}
[hidden],template{display:none}abbr[title]{border-bottom:1px 
dotted;text-decoration:none}a{background-color:transparent;-webkit-
text-decoration-skip:objects}a:active,a:hover{outline-
width:0}code,kbd,pre,samp{font-
family:monospace,monospace}b,strong{font-weight:bolder}dfn{font-
style:italic}mark{background-color:#ff0;color:#000}sub,sup{font-
size:75%;line-height:0;position:relative;vertical-
align:baseline}sub{bottom:-.25em}sup{top:-.5em}input{border-
radius:0}[role=button],[type=button],[type=reset],
[type=submit],button{cursor:pointer}[disabled]{cursor:default}
[type=number]{width:auto}[type=search]{-webkit-
appearance:textfield}[type=search]::-webkit-search-cancel-button,
[type=search]::-webkit-search-decoration{-webkit-
appearance:none}textarea{overflow:auto;resize:vertical}button,input,o
ptgroup,select,textarea{font:inherit}optgroup{font-
weight:700}button{overflow:visible}[type=button]::-moz-focus-inner,
[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-
inner,button::-moz-focus-inner{border-style:0;padding:0}
[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,
[type=submit]::-moz-focus-inner,button:-moz-focusring{outline:1px 
dotted ButtonText}[type=reset],[type=submit],button,html 
[type=button]{-webkit-appearance:button}button,select{text-
transform:none}button,input,select,textarea{background-
color:transparent;border-style:none;color:inherit}select{-moz-
appearance:none;-webkit-appearance:none}select::-ms-
expand{display:none}select::-ms-
value{color:currentColor}legend{border:0;color:inherit;display:table;ma
x-width:100%;white-space:normal}::-webkit-file-upload-button{-
webkit-appearance:button;font:inherit}[type=search]{-webkit-
appearance:textfield;outline-offset:-2px}img{border-
style:none}progress{vertical-align:baseline}svg:not(:root)
{overflow:hidden}audio,canvas,progress,video{display:inline-
block}@media screen{[hidden~=screen]{display:inherit}
[hidden~=screen]:not(:active):not(:focus):not(:target)
{position:absolute!important;clip:rect(0 0 0 0)!important}}[aria-
busy=true]{cursor:progress}[aria-controls]{cursor:pointer}[aria-
disabled]{cursor:default}::-moz-selection{background-
color:#b3d4fc;color:#000;text-shadow:none}::selection{background-
color:#b3d4fc;color:#000;text-shadow:none}ul,ol{list-
style:none;}a{text-decoration:none;}
.wrapper{overflow:hidden;}body{overflow-y:scroll;}
img{max-width:100%;}